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1994[X]
181Author    Toshiyuki Takam, KeisukeN. Akam Ura, M. Ikito Ihara, Hisanobu Wakita, Toshio YamaguchiRequires cookie*
 Title    Raman Scattering and X-ray Diffraction Studies on Zinc(II) Bromide Solutions in Methanol and N,N-Dimethylformamide in the Temperature Range 77-333 K  
 Abstract    n Z i n c (I I) B r o m i d e S o l u t i o n s i n M e t h a n o l a n d N , N -D i m e t h y l f o r m a m i d e i n t h e T e m p e r a t u r e R a n g e 7 7 -3 3 3 K The structure o f zinc(II) brom o com plexes in m ethanol and N,N-dim ethylformam ide (D M F) (molar ratio [solvent]/[ZnBr?] = 10, temperature range 7 7 -3 3 3 K) has been investigated by Raman scattering and X-ray diffraction. In the m ethanol solution symmetric Z n -B r vibrations (vt) o f the dibrom o-and tribrom ozinc(II) com plexes were observed at 209 and 184 c m " 1, respectively. With decreasing temperature the intensity o f the vx band decreased for the dibrom o and increased for the tribromo complex. In addition, the Vj band for the tetrabromo complex appeared in the supercooled and glassy methanol solutions. In the D M F solution only one band, assigned to both the dibrom o-and tribromozinc(II) com plexes, was observed. Its intensity did not change with temper­ ature. The X-ray diffraction data revealed that the average number of Z n -B r interactions within the zinc (II) bromo com plexes does not change with temperature while the number of nonbonding Br • • • Br interactions within the com plexes increases from 1.5 at 298 K to 1.9 at 243 K for the methanol solution and from 1.3 at 298 K to 1.8 at 243 K for the D M F solution. These Raman and X-ray results have confirmed that in both m ethanol and D M F solutions at high temperatures the dibrom o species is predominantly formed, whereas at low temperatures the tribromo com plex is favored, the tetrabromo species being formed only in the supercooled and glassy m ethanol solutions. The temperature dependent equilibrium shifts of the zinc(II) bromo complexes in the methanol and D M F solutions are discussed together with previously reported results for the aqueous phase. 
  Reference    Z. Naturforsch. 49a, 1119 (1994); received O ctober 15 1994 
  Published    1994 
  Keywords    Raman spectroscopy, X-ray diffraction, Zinc(II) bromide, M ethanol, N, N -D im ethyl-formamide 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1119.pdf 
 Identifier    ZNA-1994-49a-1119 
 Volume    49 
182Author    M. D. Ludwig, Zeidler, T.C F ArrarRequires cookie*
 Title     
 Abstract    N M R proton relaxation rates of normal and oxygen-17 enriched m ethanol-d3 in a mixture of 71 mol% methanol and 29 mol% dim ethylsulphoxide-d6 (D M SO) were measured as a function of temperature between 298 and 158 K. From these data rotational correlation times of the m ethanol m olecule in the mixture and the oxygen-proton dipolar spin-lattice coupling parameter were ob­ tained. The latter parameter is considerably smaller than the one obtained from neutron diffraction studies o f the molecular geometry of methanol. Additionally, deuteron and oxygen-17 relaxation rates were measured over the same temperature range. U sing the rotational correlation times obtained from the oxygen -17 induced proton relaxation rates, the quadrupole coupling constant for deuterium was derived; it shows a temperature dependence. Application o f the P oplett relation yielded the oxygen-17 quadrupole coupling constants, so that oxygen correlation times could be obtained. Com parison o f deuteron and oxygen correlation times indicates that the reorientation of the methanol m olecule in the m ethanol/D M SO mixture is anisotropic. 
  Reference    Z. Naturforsch. 49a, 1131 (1994); received August 22 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1131.pdf 
 Identifier    ZNA-1994-49a-1131 
 Volume    49 
183Author    Shi-Qi, D. Ou, B.Thimme Gowda, Helmut Paulus, Alarich WeissRequires cookie*
 Title     
 Abstract    h e B o n d N -C l . C r y s t a l S t r u c t u r e s a n d 3 5 C l N Q R o f N -C h l o r o -N -P h e n y l -2 -c h l o r o a c e t a m i d e , N -C h l o r o -N -p h e n y l -2 , 2 -d i c h l o r o a c e t a m i d e , N -C h l o r o -N -p h e n y l -2 , 2 , 2 -t r i c h l o r o a c e t a m i d e , a n d N -P h e n y l -2 , 2 , 2 -t r i c h l o r o a c e t a m i d e The crystal structures of C6H 5N C lC O C H ?Cl (1), C 6H 5N C lC O C H C l2 (2), C 6H 5N C lC O C C l3 (3), and C 6H 5N H C O C C l3 (4) have been determined at room temperature (lattice constants, d in pm). (1): P 2 ./c, Z = 4, a = 738, 6 = 645, c = 1891, 0 = 90.41°, d (N -C l) = 171, d (C = 0) = 121; (2): P2 Jc, Z = 4, a — 820, 6 = 1495, c = 905, 0 = 114.78°, d (N -C l) = 171, d (C = 0) = 120; (3): P 2 1/c, Z = 4, a = 819, 6 = 1853, c = 718, 0 = 1 0 3 .6 4 °, d (N -C l) = 172, d (C = 0) = 120; (4): P 2 1/c, Z = 4, a = 551, 
  Reference    Z. Naturforsch. 49a, 1136—1144 (1994); received July 4 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1136.pdf 
 Identifier    ZNA-1994-49a-1136 
 Volume    49 
184Author    Z. NaturforschRequires cookie*
 Title     
 Abstract    f l -C h l o r o -2 -m e t h y l -2 -c h l o r o m e t h y l p r o p i o n i c A c id (/?, / T -D i c h l o r o p i v a l i c A c i d) , P h a s e I I Roman S trau ß 2, Shi-qi D o u 1, H artm ut Fuess2, and Alarich W eiss1 The phase diagram and the 35C1 N Q R spectrum of (C lH 2C)2(CH 3)C -C O O H have been studied 
  Reference    Z. Naturforsch. 49a, 1145 (1994); received July 16 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1145.pdf 
 Identifier    ZNA-1994-49a-1145 
 Volume    49 
185Author    O. Wegener3, R. K. Üchler3, A. W. AtterichbRequires cookie*
 Title      
 Abstract    12STe nuclear spin relaxation (NSR) and electrical conductivity measurements were performed on ultrapure single-crystalline paratellurite (a -T e0 2) between about 50 K and the melting point (1007 K) at various oxygen partial pressures (1 b a r -10"4 bar). At elevated temperatures the NSR rate l / 7 \ and conductivity a are caused by the diffusive motion o f point defects. From the observed p02-dependence of 1/Ti and a a defect model is developed which is shown to be consistent with the experimental data. The m odel involves ionic oxygen interstitials (O"), doubly charged oxygen vacancies (Vo') and charge-com pensating electron holes (h'). The observed pressure dependence suggests that the N SR rate is induced by the m otion of \ q while the conductivity is due to the m obility o f h*. Evaluation o f the data leads to 3.3 eV for the incorporation enthalpy o f oxygen on interstitial sites and to 4.5 eV for the formation enthalpy of oxygen Frenkel pairs (O "-V q'). Further, the chemical diffusion coefficient Dc is found to be caused by the ambipolar diffusion o f OS' and h \ At 950 K we obtained from both the NSR and conductivity experiments D c = (1 ± 0.3) • 10" 5 cm 2/s. 
  Reference    Z. Naturforsch. 49a, 1151 (1994); received August 22 1994 
  Published    1994 
  Keywords    Oxides, Point defects, Diffusion, N M R, Conductivity 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1151.pdf 
 Identifier    ZNA-1994-49a-1151 
 Volume    49 
186Author    FevziK. Öksal, M. Etin YavuzRequires cookie*
 Title     
 Abstract    f s o m e I r r a d i a t e d A m m o n i u m C o m p o u n d s G am m a irradiation dam age centres in (N H 4)2SiF6, (N H 4)2SnCl6, (N H 4)2PtC l6, [(CH3)2N H 2]2SnCl6, (N H 4)2PdCl6 and ultraviolet irradiation damage centres in (CH 3)4N C H 3CO O and (C H 3)4N Br have been investigated by electron paramagnetic resonance spectroscopy. It has been found that the radicals produced in (N H 4)2SiF6 and (N H 4)2SnCl6 is N 2H 4 , and those in (N H 4)2P tC l6 are N H 3 and (P tC l6)3 -. In [(CH3)2N H 2]2SnCl6 the species is (C H 3)2N H + , and in (N H 4)2PdC l6 the species is (P dC l6)3 -. Furthermore, it has been shown that the ultraviolet irradia­ tion produces C H 3 and C 0 2 radicals in (C H 3)4N C H 3CO O and C H 3 radical in (C H 3)4NBr. The EPR parameters of the observed radicals have been determined. 
  Reference    Z. Naturforsch. 49a, 1159 (1994); received August 22 1994 
  Published    1994 
  Keywords    EPR, G am m a irradiation, Utraviolet, Ammonium com pounds, Free radicals 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1159.pdf 
 Identifier    ZNA-1994-49a-1159 
 Volume    49 
187Author    Stephan Kohlsmann, Matthias Hetscher, Klaus KramerRequires cookie*
 Title    Application of a Miniaturised Probe for the Acquisition of Dielectric Data in Living Systems  
 Abstract    Dedicated to Werner Müller-Warmuth on the occasion of his 65 th birthday The complex permittivity e* has been measured non-invasively in the cornea of two types of animal eyes and in erythrocyte suspensions in the frequency domain 1 ... 18,000 MHz. These measurements shall help to distinguish between eye diseases in a very early stage and to track the possible effect of "microthermics", respectively. The analysis of the miniaturised probe used for the reflection method and the experimental set-up with its automatic scanning facility are presened. 
  Reference    Z. Naturforsch. 49a, 1165—1170 (1994); received September 2 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1165.pdf 
 Identifier    ZNA-1994-49a-1165 
 Volume    49 
188Author    J.-Ch Buhl, C. Mundus, J. Löns, W. HoffmannRequires cookie*
 Title    On the Enclathration of N aB(O H )4 in the /J-Cages of Sodalite: Crystallization Kinetics and Crystal Structure  
 Abstract    The hydrothermal formation of sodium hydroxyborate enclathrated sodalite synthesized from an initial ternary mixture of mullite, cristobalite and corundum has been investigated. Depending on temperature and pressure the compound Na7-5[AlSi04]6[B(0H)4]1.5 • 2 H 20 could be synthesized in form of polycrystalline powder as well as in form of single crystals. The kinetics of the sodalite growth could be determined at 423 K and 473 K. 29Si-and 27A1 MAS NMR was shown to be the preferred method to describe the conversion into sodalite quantitatively. Evidence for the first formation of polycrystalline sodalite has been found after the total dissolution of mullite and cristobalite. Single crystal X-ray diffraction data were used for the structure determination and refinement. The position and orientation of the hydroxyborate anions within the sodalite's /J-cages could only be found in the course of a "rigid body" refinement with constraints for the B(OH)4 tetrahedron. The boron atoms are located in an off-centre position within the sodalite cages. One out of the four oxygen atoms of the hydroxyborate group is positioned near the centre of a face of the sodium tetrahedron, whereas the three remaining oxygen atoms are near to the middle of its edges. 
  Reference    Z. Naturforsch. 49a, 1171—1178 (1994); received September 26 1994 
  Published    1994 
  Keywords    Sodalite solid solution, Crystallization kinetics, IR-spectroscopy, MAS NMR, Structure refinement 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1171.pdf 
 Identifier    ZNA-1994-49a-1171 
 Volume    49 
189Author    H. Gotzig, S. Grunenberg-Hassanein, F. NoackRequires cookie*
 Title    N M R Field-Cycling Study of Rotational Flow and Viscosity in Nematic Liquid Crystals  
 Abstract    A proton NM R method is described which enables rotational flow and viscosity measurements of low molecular weight nematic liquid crystals (NLC's). This is achieved by an extension of the common NM R field-cycling technique, namely by fast electronic switching of both the external magnetic field direction and strength. In thermodynamic equilibrium, the director of an NLC with positive diamagnetic anisotropy (A/ > 0) orients parallel to the external magnetic field. Thus a change of this direction causes a reorientation process of the molecules to align to the new equilib­ rium, which in low viscous systems in contrast to polymer liquid crystals is rather fast and hence requires fast field switching. We have studied systematically this response as a function of the initial field rotation angle 90 relative to the director for some homologous NLC's of the n-alkyl-cyano-biphenyl (nCB) series. It is shown that there exists a critical angle 0cr in such a way that for 0o < 0C T the director rotation is homogeneous and only controlled by the rotational viscosity y j. For 0O > 9cr, however (e.g. in the case of 5 CB 0C T is « 85 degrees) the viscoelastic behaviour is more complicated because of a coupling between flow and director gradients. The analysis of the alignment process by the changes of the proton line spectra also allows to determine the Leslie viscosities at, a2, a3, a4 + a5, and the average Frank elastic constant K by a single measurement. 
  Reference    Z. Naturforsch. 49a, 1179—1187 (1994); received August 22 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1179.pdf 
 Identifier    ZNA-1994-49a-1179 
 Volume    49 
190Author    Ulrike Werner-Zwanziger, Marcia Ziegeweid, Bruce Black, Alexander PinesRequires cookie*
 Title    Nitrogen-14 SQ U ID N Q R of L-Ala-L-His and of Serine  
 Abstract    In honor of Professor Dr. Werner Miiller-Warmuth on his 65 th birthday 14N nuclear quadrupole resonance spectroscopy, detected with a Superconducting Quantum Interference Device, makes possible the study of nitrogen environments in amino acids and small peptides. The present experiments characterize: 1) the effects of intermolecular interactions upon the amino nitrogen of serine upon cocrystallization of the stereoisomers in a range of concentrations; 2) the changes of the amino and imidazole nitrogen environments brought about by combining L-Alanine and L-Histidine into the dipeptide L-Ala-L-His. 
  Reference    Z. Naturforsch. 49a, 1188—1192 (1994); received August 22 1994 
  Published    1994 
  Keywords    SQUID, NQR, Amino acids, Nitrogen-14 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1188.pdf 
 Identifier    ZNA-1994-49a-1188 
 Volume    49 
191Author    S. CloughRequires cookie*
 Title    The Rotational Spectrum of Tunnelling Methyl Groups  
 Abstract    The quantum-classical transition of methyl rotation highlights conflicting assumptions of quan­ tum and classical mechanics, the first assuming that identical fermions are indistinguishable while the second recognises they are distinguishable through their histories. When this is introduced into quantum mechanics, the two are compatible and there is a smooth transition of the methyl rotational spectrum with increasing temperature through the merger of three broadening peaks. The changing character of methyl dynamics through this transition is discussed. 1. The Quantum-Classical Transition 
  Reference    Z. Naturforsch. 49a, 1193—1199 (1994); received September 26 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1193.pdf 
 Identifier    ZNA-1994-49a-1193 
 Volume    49 
192Author    U. Pegelow3, M. Winterer2, B. D. Mosel3, M. Schmalzb, R. SchöllhornbRequires cookie*
 Title    Mössbauer Studies of Nickel-Iron Hydrotalcites  
 Abstract    Dedicated to Professor Werner Müller-Warmuth on the occasion of his 65 th birthday Hydrotalcite-like Fe-Ni-hydroxides [Ni2I/3Fe1 1 I/ I3(0H)2](C03)1/6(H20)> ,, [Ni3/4Fe1 1 '/ l4(OH)2]-(C 0 3)1/8(H20)y and [Ni3 //4IFe1 1 I/ '4(OH)2](CO3)0 14(H20)y as well as the ternary oxide NaNi2/3Fe1/30 2 have been studied by 57Fe-Mössbauer spectroscopy. All samples contain Fe3+ in a high spin state. The quadrupole interaction is smaller if a magnetic splitting is present, which may indicate a non-parallel arrangement of the principal axis of the EFG and the hyperfine field. The temperature dependence of the spectra has been understood in terms of collective cluster excitations. In this model the magnetic energy of a single domain depends on the direction of the total magnetic moment and on magnetic interaction with the neighbourhood. The spectral lineshape could be fitted assum­ ing uniaxial relaxation. 
  Reference    Z. Naturforsch. 49a, 1200—1206 (1994); received September 26 1994 
  Published    1994 
  Keywords    Mössbauer spectroscopy, Nickel-iron hydrotalcite, Fe(III) high spin, Collective cluster excitations 
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 Identifier    ZNA-1994-49a-1200 
 Volume    49 
193Author    Celso GrebogiRequires cookie*
 Title    Linear Scaling Laws in Bifurcations of Scalar Maps  
 Abstract    A global scaling property for bifurcation diagrams of periodic orbits of smooth scalar maps with both one and two dimensional parameter spaces is examined. It is argued that for both parameter spaces bifurcations within a periodic window of a given scalar map are well approximated by a linear transformation of the bifurcation diagram of a canonical map. 
  Reference    Z. Naturforsch. 49a, 1207—1211 (1994); received October 12 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1207.pdf 
 Identifier    ZNA-1994-49a-1207 
 Volume    49 
194Author    Á. Péntek1, Z. Toroczkai1, D. H. Mayer2, T. TélRequires cookie*
 Title    A Generalized Kac Model as a Dynamical System  
 Abstract    Ising chains characterized by smoothly varying two-body potentials, including a generalized version of the Kac model, are studied. As a novel aspect we show that one-dimensional maps associated with such chains in the spirit of the thermodynamical formalism possess fractal deriva­ tives. We discuss how long-range potentials lead to intermittent-like behavior in the associated one-dimensional map. 
  Reference    Z. Naturforsch. 49a, 1212—1214 (1994); received October 12 1994 
  Published    1994 
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 Identifier    ZNA-1994-49a-1212 
 Volume    49 
195Author    R. Stoop3, W.-H SteebbRequires cookie*
 Title    Entropie Characterisation of Diffusion  
 Abstract    The thermodynamic approach is applied for the description of normal and anomalous diffusion of one-dimensional maps on a grid of unit cells. The characteristic entropy functions are calculated. For the anomalous cases, the locations of the critical lines are determined. 
  Reference    Z. Naturforsch. 49a, 1215—1218 (1994); received October 12 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1215.pdf 
 Identifier    ZNA-1994-49a-1215 
 Volume    49 
196Author    Günter RadonsRequires cookie*
 Title    Mechanisms for Phase Transitions in the Multifractal Analysis of Invariant Densities of Correlated Random Maps  
 Abstract    Multifractal properties of the invariant densities of correlated random maps are analyzed. It is proven that within the thermodynamical formalism phase transitions for finite correlations may be due to transients. For systems with infinite correlations we show analytically that phase transitions can occur as a consequence of localization-delocalization transitions of relevant eigenfunctions. 
  Reference    Z. Naturforsch. 49a, 1219—1222 (1994); received October 12 1994 
  Published    1994 
  Keywords    Fractals, Dynamical systems, Phase transitions, Stochastic automata, Random walk 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1219.pdf 
 Identifier    ZNA-1994-49a-1219 
 Volume    49 
197Author    K. G. Szabó, T. TélRequires cookie*
 Title    Constrained Frobenius-Perron Operator to Analyse the Dynamics on Composed Attractors  
 Abstract    In this contribution we propose a technique to analyse arbitrary invariant subsets of chaotic dynamical systems. For this purpose we introduce the constrained Frobenius-Perron operator. We demonstrate the use of this operator by determining the geometrical multifractal spectrum of invariant chaotic subsets of one-dimensional maps which are either coexisting side by side indepen­ dently or are embedded in a larger set close to a crisis configuration. 
  Reference    Z. Naturforsch. 49a, 1223—1228 (1994); received October 12 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1223.pdf 
 Identifier    ZNA-1994-49a-1223 
 Volume    49 
198Author    Zoltán Kovács, Laurent WiesenfeldbRequires cookie*
 Title    H ie ra rc h ic A n alysis o f C h a o tic S c a tte rin g in R eactive C ollisions  
 Abstract    The method of classical trajectories is applied for a double Morse potential modeling indirect reactive collisions of three collinear atoms. The system shows chaotic scattering, which is studied in details through a hierarchic analysis of the singularities of the time delay function. Tools of the thermodynamic formalism are used to extract global quantities characterizing the scattering process. 
  Reference    Z. Naturforsch. 49a, 1229—1232 (1994); received October 12 1994 
  Published    1994 
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 Identifier    ZNA-1994-49a-1229 
 Volume    49 
199Author    W. JustRequires cookie*
 Title    B ifu rca tio n s in G lo b a lly C oupled S h ift M a p s  
 Abstract    A map lattice of globally coupled shift maps is investigated by analytical methods. The breakdown of the well known space time mixing regime at weak coupling strength is accompanied by a global synchronization of the maps. Furthermore a Cantor set like repeller survives which produces chaotic transients. 
  Reference    Z. Naturforsch. 49a, 1233—1234 (1994); received October 12 1994 
  Published    1994 
  Keywords    Coupled map lattice, Symbolic dynamics, Synchronization PACS No: 0545 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1233.pdf 
 Identifier    ZNA-1994-49a-1233 
 Volume    49 
200Author    Zoltán Toroczkaia, Áron PéntekRequires cookie*
 Title    D etec tin g Phase T ran sitio n s in In te rm itte n t System s by U sing the T h e rm o d yn am ica l F o rm a lis m  
 Abstract    Here we illustrate the effectiveness of the thermodynamical formalism applied to a well known chaotic phenomenon, the intermittency. This leads us to a new classification for intermittent phe­ nomena from the point of view of the generated chaotic phases in the spectrum of the generalized entropies K (q). New types of intermittencies are found related to the absence or presence of phase transitions with infinite jump in K (q). This is underlined with examples. It is also shown via examples that the existence of a marginally stable fixed point in the system is neither necessary nor sufficient for intermittency. 
  Reference    Z. Naturforsch. 49a, 1235—1237 (1994); received October 12 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-1235.pdf 
 Identifier    ZNA-1994-49a-1235 
 Volume    49 
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