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1980[X]
141Author    G. Peschel, P. BelouschekRequires cookie*
 Title    Repulsion Phenomena in Thin Layers of Alcoholic Solutions of Tetrabutylammonium Iodide  
 Abstract    The structural disjoining pressure of methyl-, ethyl-, n-propyl, and n-butyl alcohol was deter-mined in thin layers between highly smooth rutile surfaces when tetrabutylammonium iodide was added. The a verage thickness of the oriented solvation layers per interface turned out to be largest for methyl alcohol (about 1.5 nm) and decreases like the disjoining pressure when passing to the related alcohols with longer chain lengths. Tetrabutylammonium iodide clearly reduces the thick-ness of the boundary layer with increasing concentration. 
  Reference    Z. Naturforsch. 35a, 869—875 (1980); received June 25 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0869.pdf 
 Identifier    ZNA-1980-35a-0869 
 Volume    35 
142Author    R. SpehrRequires cookie*
 Title    Calculation of the Lifetimes of Localized Electronic Vacancies in Cyclic Molecules  
 Abstract    For a benzenelike ring of six carbon atoms the dissipation of localized electron vacancies of TI and of a symmetry is calculated. The vacancies are described by Wannier sums. The calculation yields lifetimes of localization of about 10~ 16 s in both cases. These values are shorter by two orders of magnitude than any period of molecular vibrations. Therefore such transiently localized vacancies, which can be caused by irradiation or by statistical fluctuations, will not destroy any bond in organic molecules. 
  Reference    Z. Naturforsch. 35a, 876—882 (1980); received June 7 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0876.pdf 
 Identifier    ZNA-1980-35a-0876 
 Volume    35 
143Author    M.M B Wijnakker, E.H A GrannemanRequires cookie*
 Title    Limitations on Mass Separation by the Weakly Ionized Plasma Centrifuge  
 Abstract    In weakly ionized argon and xenon rotating plasmas the rotational velocity and the temperature and pressure distribution have been measured. The stationary discharge is generated by two opposed cathode-anode configurations. The arc current of 100 A is drawn across an axial magnetic field up to 0.26 T. The filling pressure ijs varied between 1 and 10 torr. The rotational velocity is found to be proportional to the discharge current and the magnetic field and inversely proportional to the viscosity of the neutral gas. The rotational kinetic energies of the particles in the argon and xenon discharge are about equal. Because the temperature of the argon discharge is lower than that of the xenon discharge, the pressure rise in radial direction due to centrifugal forces is steeper for the former. A theoretical analysis taking into account viscous dissipation as the only heating mechanism yields a heavy particle temperature T which imposes an upper limit to the ratio X — \m ve 2 /kT of order unity. The maximum attainable separation factor a is therefore limited in these types of centrifuges. Experimentally, in the parameter region studied, X is found not to exceed a value 0.4 in argon discharges and 0.2 in xenon discharges. A rough estimate shows that besides viscous dissipation other heating mechanisms are also important. Ohmic heating, for instance, is at least a factor 6 larger than the viscous dissipation. 
  Reference    Z. Naturforsch. 35a, 883 (1980); received January 14 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0883.pdf 
 Identifier    ZNA-1980-35a-0883 
 Volume    35 
144Author    Z. NaturforschRequires cookie*
 Title      
 Abstract    A discrepancy between theoretical and experimental values concerning the variation of decay constant of 99m Tc is cleared up. A new preparation of hexachlorotechnetate complex by reduction of pertechnetate ion with hydrazine is given. The corrected experimental results are A(TC04-) -A(TcCl$—) = (1,93 ± 0,12) • 10~ 3 1, A(TC04-) -A(TcBr6—) = (2,44 ± 0,30) • 10" 3 A, A(TC04-) -A(TcJ6—) = (3,22 ± 0,29) • 10~3 A. 
  Reference    Z. Naturforsch. 35a, 894—895 (1980); eingegangen am 30. Mai 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0894_n.pdf 
 Identifier    ZNA-1980-35a-0894_n 
 Volume    35 
145Author    M. Alicka, R. K. Bauer, A. KawskiRequires cookie*
 Title    Die Viskositätsabhängigkeit der Fluoreszenz - Anisotropie und der Lebensdauer von Trans-Stilben  
 Abstract    The fluorescence anisotropy r and lifetime TF of trans-stilbene in different solvents has been measured and the dielectric relaxation time from Perrin and Debye equations has been determined. The fluorescence lifetime in the viscosity region from 0.321 to 61.92 Nm _2 s, varies between 30 and 152 ps. Die mittlere Abklingzeit tp des trans-Stilbens in Lösung (Chloroform) wurde von Wilhelmi und Mitarbeitern [1] durch eine Messung der S^Sn-Ab-sorption nach Laserimpuls-Anregung ermittelt. Eine prinzipiell ähnliche Methode wurde auch in nachfol-genden Arbeiten [2, 3] angewandt. Birch und Birks [4], sowie Sumitani und andere [5] ermittelten die Abklingzeit von trans-Stilben mit Hilfe der Einzelphotonenzählung bzw. mit der Streak-Kamera aus der Fluoreszenzabklingkurve. Die nach verschiedenen Verfahren ermittelten Tp-Werte des trans-Stilbens unterscheiden sich sehr stark. In den Arbeiten [5 — 7] werden dafür ver-schiedene Ursachen diskutiert. Die unmittelbare TP-Messung von Sumitani u. a. [5] ergab für den ersten angeregten Singuletzustand Sj des trans-Stilbens in 3.2-Methylcyklohexan/iso-hexan bei Zimmertempe-ratur einen Wert von 108 ps in guter Übereinstim-mung mit der tp-Konstante aus dem Löschungsexpe-riment (100 ps [8]). Wenn die Fluoreszenzabklingzeit tp bei Zimmer-temperatur klein ist, erwartet man schon in flüs-siven Lösungsmitteln kleiner Viskositäten (1 X 10~ 3 Nm~ 2 s), eine wesentliche anisotrope Fluores-zenz [9]. * Diese Arbeit ist im Rahmen des Forschungsprojektes M.R. 1.5.2 durchgeführt worden. 
  Reference    Z. Naturforsch. 35a, 896—897 (1980); eingegangen am 14. Mai 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0896_n.pdf 
 Identifier    ZNA-1980-35a-0896_n 
 Volume    35 
146Author    Heinrich WelkerRequires cookie*
 Title    Superconductivity and Mixed Conduction  
 Abstract    The BCS-formula for the energy gap AE is extended to include the magnetic exchange inter-action of electrons with holes. With the improved expression for AE the transition temperatures of A15-structures are computed and found to be in a satisfactory agreement with the experimental values. 
  Reference    Z. Naturforsch. 35a, 899—901 (1980); received August 7 1970 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0899.pdf 
 Identifier    ZNA-1980-35a-0899 
 Volume    35 
147Author    J. SchupfnerRequires cookie*
 Title    On the Theory of Thermally Weighted Electron-Phonon Transition Probabilities  
 Abstract    We present a refined calculation method for the phonon part (Franck-Condon Overlaps) of the transition probabilities of electron-phonon radiative and non-radiative transitions in crystals. The evaluation of the thermal averaged Franck-Condon integrals is a purely algebraic method and the transition probabilities we use are derived from first principles and completely atomistic. For the electronic transitions we take into account the frequency shift of the lattice and the change of the phonon normal coordinates. Explicit formulae of the phonon parts are derived and it is shown that the common transition probabilities used in literature are special cases of our func-tional calculation technique. 
  Reference    Z. Naturforsch. 35a, 902—914 (1980); received June 23 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0902.pdf 
 Identifier    ZNA-1980-35a-0902 
 Volume    35 
148Author    S. HessRequires cookie*
 Title    Viscoelasticity Associated with Molecular Alignment  
 Abstract    Viscoelasticity as it becomes apparent through the oscillatory motion in flow relaxation ex-periments is studied theoretically for liquids and liquid solutions containing nonspherieal par-ticles. The coupling between the viscous flow and the molecular alignment which underlies the flow birefringence gives rise to a viscoelastic behavior. The relevant time scale is determined by the orientational relaxation time rather than the (often much shorter) Maxwell relaxation time. The possible relevance of the present theory for the viscoelastic behavior of some dilute aqueous detergent solutions is discussed. 
  Reference    Z. Naturforsch. 35a, 915—919 (1980); received June 12 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0915.pdf 
 Identifier    ZNA-1980-35a-0915 
 Volume    35 
149Author    R. N. Khanna, R.P S RathoreRequires cookie*
 Title    Improved Versions of Fielek Model for BCC Transition Metals  
 Abstract    Three improved versions of the Fielek Model are developed and discussed. The first model uses a modified Bhatia scheme for the volume interaction in place of the Krebs scheme. The second and third model assumes the core-core couplings to be central pairwise effective upto first neighbours only. The second model describes the d-shell—d-shell interaction on the same lines as those adopted for core-core interactions, while the third model assumes these interactions to be of the many body type. Suitable equilibrium conditions for the second and the third model are developed. These improved versions are employed to derive dispersion relations in tantalum. Comparison of these relations with-each other and also with the experimental findings leads to some important conclusions regarding the nature and range of the interactions coupling the various constituents of a bcc transition metal like tantalum. 
  Reference    Z. Naturforsch. 35a, 920—923 (1980); received June 3 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0920.pdf 
 Identifier    ZNA-1980-35a-0920 
 Volume    35 
150Author    Th Mugele, V. Graf, W. Wülfel, F. NoackRequires cookie*
 Title    Investigation of Molecular Motion in Smectic Phases of the Liquid Crystal TBBA by NMR Relaxation Dispersion  
 Abstract    The proton spin T\ relaxation dispersion in the smectic A and C phase of TBBA, and for com-parison also in the nematic phase, have been studied using time dependent fast field-cycling techniques in the Larmor frequency range from rp = 100 Hz to 44 MHz. Our measurements con-siderably extend recent ones by Blinc et al., performed with other NMR methods for frequencies 140 kHz. The new experimental data are consistent with the reported ones for Sm C but not for Sm A, the difference being that the essential Ti dispersion observed with our technique occurs at much lower frequencies, namely below about 100 kHz. As a consequence, the relaxation dis-persion for both smectic phases looks very similar. It can be described quantitatively in terms of relaxation by "nematic-like" order fluctuations, self-diffusion, and by a third molecular mecha-nism with (for simplicity) Debve-like power spectrum, which is possibly a second type of order fluctuation or a molecular rotation about the short axis. The analysis reveals surprisingly far going parallels between the spin relaxation of simple smectics and that of high-temperature nematics like PAA. 1. The Problem Up to date, the nuclear spin relaxation mecha-nisms in smectic liquid crystals is far less understood than those in nematics. Only very few systematic papers on the subject have been published [1—3], and none of the recent reviews on nuclear relaxation in liquid crystals [4] includes a detailed treatment of smectic phases. Since 1975 the pioneering works in the field have been performed by Blinc et al. [1], who transferred the basic ideas of the well-establish-ed relaxation models for nematics to smectics and who applied this theory to experimental data ob-tained for the various mesophases of TBBA (terephthal-bis-p-butylaniline) with emphasis on smectic A (SmA) and smectic C (SmC). From measurements of the longitudinal proton spin relaxa-tion time T1 in the Larmor frequency range between Vp = C0p/2 7i = 140 kHz and 90 MHz it was con-cluded for these two high-temperature smectic phases, which alone will be considered in the follow-ing, that order fluctuations (OF), self-diffusion (SD), and rotational motions (R) contribute to the total relaxation rate with different strength. Like in nematics, the OF mechanism was found dominant at low frequencies, whereas the SD mechanism took over in the high-frequency regime. Surprisingly, the 
  Reference    Z. Naturforsch. 35a, 924—929 (1980); received July 7 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0924.pdf 
 Identifier    ZNA-1980-35a-0924 
 Volume    35 
151Author    Gerhard Hermann, Richard Bek, Siegfried SteebRequires cookie*
 Title    Part 1: X-Ray High-Angle Scattering and Ultrasonic-Measurements  
 Abstract    By means of X-ray scattering and ultrasonic experiments, the structure of different melts of the Cd-Ga system was investigated. The structure factors S (q) obtained for the pure elements agree well with those reported by other authors. The concentration dependence of the structure factors shows no special features. From the structure factors, the total pair-distribution functions were calculated by a Fourier transformation. The nearest-neighbour distances, obtained from the total pair-distribution functions, amount to 3.04 Ä for pure Cd and 2.83 A for pure Ga and are nearly constant for all alloys. The concentration dependence of the experimental nearest-neigh-bour distances and coordination numbers was determined and is compared with statistical distri-bution and macroscopic segregation models. These comparisons tend to indicate a preference for like-atom neighbours. From the long-wavelength limit S(0) of the structure factors of Cd and Ga, the isothermal compressibilities were calculated. These show a satisfactory agreement with those calculated from adiabatic sound velocity data. The anomalous ultrasonic absorption of a single melt with nearly critical concentration indicates the existence of concentration fluctuations. This result is in agreement with those obtained by X-ray smallangle scattering experiments which are described in Part 2 of this work [1]. 
  Reference    Z. Naturforsch. 35a, 930—937 (1980); received June 30 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0930.pdf 
 Identifier    ZNA-1980-35a-0930 
 Volume    35 
152Author    Gerhard Hermann, Georg Rainer-Harbach, Siegfried SteebRequires cookie*
 Title    Structure of Cd-Ga Melts Part 2: X-Ray Small-Angle Scattering  
 Abstract    X-ray small-angle scattering experiments were performed on nine melts of the Cd-Ga system at different temperatures up to 440°C. Evaluation of the data follows the Ornstein-Zernike theory of critical scattering, thus yielding correlation lengths £ of concentration fluctuations and the long-wavelength limit Sec (0) of the Bhatia-Thornton structure factor. Studies of the concen-tration and temperature dependence of £ and Sec (0) indicate that the critical point occurs at cc = 50.0 ± 1-0 at % Ga and Tc — 295.2 ± 0-1° C. For a melt with the critical concentration, Sec (0) increases up to 3500 times the ideal $cc (0)=CACB-This indicates a strong segregation ten-dency. In the vicinity of the critical point of the Cd-Ga system, experimental correlation lengths | > 100 A were obtained. The critical-point exponents v and y were determined. It follows that the behaviour of a critical Cd-Ga melt satisfies the prediction of the classical mean-field theory for higher temperatures, whereas, within experimental accuracy, the lattice-gas predictions are satisfied upon approaching the critical temperature. 
  Reference    Z. Naturforsch. 35a, 938—945 (1980); received June 30 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0938.pdf 
 Identifier    ZNA-1980-35a-0938 
 Volume    35 
153Author    R. K. Bauer, A. KowalczykRequires cookie*
 Title    Decay Times Study on the Fluorescence of 4-Methylumbelliferone  
 Abstract    Phase, pulse and steady-state measurements of ethanolic solutions of 4-methylumbelliferone with various water and hydrochloric acid contents were performed. A kinetic model is proposed and some parameters are determined. 
  Reference    Z. Naturforsch. 35a, 946—950 (1980); received June 14 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0946.pdf 
 Identifier    ZNA-1980-35a-0946 
 Volume    35 
154Author    Giorgio Flor, JohnL. Bjorkstam, Marco VillaRequires cookie*
 Title    A Thermogravimetric and NMR Study of P-Aluminas  
 Abstract    The Na+ tracer diffusion coefficient and the 27 A1 NMR spin lattice relaxation time in Na ß-alumina display an anomalous temperature dependence near 470 K. These phenomena are related to absorption of water which takes place when the temperature is decreased below 470 K. Water absorption processes in pure and partially substituted ^-aluminas are studied by thermogravi-metric analysis. Their effects upon conductivity are qualitatively discussed. 
  Reference    Z. Naturforsch. 35a, 951—954 (1980); received August 6 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0951.pdf 
 Identifier    ZNA-1980-35a-0951 
 Volume    35 
155Author    M. RoederRequires cookie*
 Title    Alkali-Halide Chemiluminescence: Studies on the Fluctuation Bands from some Alkali (Li, Na, K)-Halogen (CI, Br, I)-Reactions  
 Abstract    Molecular chemiluminescence spectra from selected alkali-halogen reactions are presented using a beam-gas arrangement operating with pressures between 10 -1 mtorr (single collision conditions) up to 10 mtorr in the reaction zone. Spectra are presented for the chemiluminescent reactions M2 + X2->MX* + MX, where M2 = K2, Na2 and X2 = C12, Br2,12. The MX* emitter is identified by comparison with previous absorption and emission studies of these molecules. The sodium reaction with I2 as well as all lithium reactions with different halogens (CI2, Br2,12) do not yield appreciable molecular emission. The differences in molecular chemiluminescence inten-sities among this type of reactions can be understood in terms of the Landau-Zener formalism for an electron jump and turn out to be consistent with the results from measurements on absorption, emission and dissociation. 
  Reference    Z. Naturforsch. 35a, 955—959 (1980); received July 11 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0955.pdf 
 Identifier    ZNA-1980-35a-0955 
 Volume    35 
156Author    P. Schattschneider, A. WagendristelRequires cookie*
 Title    The Influence of the Grain Shape on X-Ray Line Broadening  
 Abstract    The analysis of X-ray reflections allows for the determination of the grain dimension in the direction of the bisector of the incident and scattered radiation. It is shown that correct results will be obtained only as long as the grain dimensions perpendicular to this direction are sufficiently large. The possible errors are estimated. The conditions for the determination of the shape aniso-tropy are discussed. 
  Reference    Z. Naturforsch. 35a, 960—963 (1980); received July 7 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0960.pdf 
 Identifier    ZNA-1980-35a-0960 
 Volume    35 
157Author    U. RamacherRequires cookie*
 Title    Faddeev Equations in the Functional Quantum Theory of the Non-Linear Spinorfield  
 Abstract    Starting with a linear partial differential operator for a certain system of transition amplitudes associated to a state | a} with baryon number o(a) we derive an equation in the o(a)-sector of the Functional space which provides the state | a> with an effective potential caused by the polariza-tion cloud. With regard to the needs of n-body scattering we then undertake a cluster decomposi-tion of the effective potential. In particular, we derive the relativistic analoga of Lippmann-Schwinger-and Faddeev equations. In non-linear spinor theory as treated by Heisen-berg [1] and coworkers [2] a physical state |a> is determined by a linear partial differential operator acting in a certain infinite system of transition amplitudes between the vacuum and the state | a). That means, the dynamical behaviour of any asymp-totic w-particle configuration is governed by no sub-system other than the whole system of field equa-tions; that is why the Hilbertspace of the field operator cannot have Fock-space structure. On the other hand, the system of field equations carries an algebraic structure which is best represented on Fock-space. Therefore, it is natural to define state vectors by oo 0 (j, a) := 2 I''' Xn (x i'"" x i | a) n = 0 • j(xi) • • 'j(xn)Q\ here the <p's are time-ordered transition amplitudes between the vacuum Q and state | a), and j is one of the generators of an abstract Clifford algebra (j, • &, Q). The set of all state vectors generated by all physical states is called functional state space. It was Stumpf [3] and coworkers who began con-structing the functional state space and therein formulating the essentials of Heisenberg's dipole regularized spinorfield theory. According to Stumpf [4] the Functional Quantum Theory of the non-linear spinorfield has to deal mainly with three problems: 
  Reference    Z. Naturforsch. 35a, 964—972 (1980); received May 21 1980* 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0964.pdf 
 Identifier    ZNA-1980-35a-0964 
 Volume    35 
158Author    R. Voss, G. Lehmpfuhl, P. J. SmithRequires cookie*
 Title    Influence of Doping on the Crystal Potential of Silicon investigated by the Convergent Beam Electron Diffraction Technique  
 Abstract    Low index structure potentials of silicon were determined by convergent beam electron dif-fraction (Kossel-Möllenstedt technique) from very small crystal areas of about 100 Ä in diameter. The values of 111, 222, 220, 113 and 004, determined to an accuracy of ±0.03 volts, are in ex-cellent agreement with the accurate X-ray results of Aldred and Hart (see [6], p. 239). Heavy arsenic or phosphorous doping was found to cause a shift of 0.15 volts in the 111 structure poten-tial. Absorption potentials were also determined and found to be 1/3 of the theoretical values published by Radi [20]. 
  Reference    Z. Naturforsch. 35a, 973—984 (1980); received July 12 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0973.pdf 
 Identifier    ZNA-1980-35a-0973 
 Volume    35 
159Author    B. Steffen, R. HosemannRequires cookie*
 Title    Structure and Packing Density of Liquid Metals  
 Abstract    Recent results concerning the structure of microparacrystals established in different melts are reported. In spite of structural differences among the investigated samples the reduced density is always the same. This approach is possibly a first step towards a correlation between the hard sphere concept of statistical mechanics and our refined structural analysis. 
  Reference    Z. Naturforsch. 35a, 985 (1980); received July 17 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0985.pdf 
 Identifier    ZNA-1980-35a-0985 
 Volume    35 
160Author    Z. B. Maksić, K. RupnikRequires cookie*
 Title    Semiempirical Studies of Inner-Core Energy Levels. IV. ESCA Shifts of Nitrogen Atoms in Different Chemical Environments by the SCC-MO Method  
 Abstract    The binding energy shifts of the Is levels of nitrogen atoms in 15 different bonding situations are calculated by the self-consistent charge molecular orbital (SCC-MO) method employing an electrostatic potential model in the point charge approximation. The standard deviation of the obtained correlation is ~ 0.5 eV, which is substantially better than the earlier CNDO/2 GPM and RPM results. The scatter of the correlated values is diminished to roughly 1/3 of the previous CNDO/2 results. The merits and shortcommings of the electrostatic potential model are briefly discussed. It is concluded that the present approach provides a useful tool for studying ESCA shifts in large molecules of biochemical interest. 
  Reference    Z. Naturforsch. 35a, 988—991 (1980); received May 17 1980 
  Published    1980 
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 TEI-XML for    default:Reihe_A/35/ZNA-1980-35a-0988.pdf 
 Identifier    ZNA-1980-35a-0988 
 Volume    35 
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