Volume 23 (1988)

Contributions

• A. Kunz: A Note about the Negentropy Principle, pp. 3-8
• S. B. Elk: The Limitations of Describing Chemical Compounds by Virtue of Their Graph Theoretical Representation by a Computer, pp. 9-18
• S. B. Elk: Connotations Inherent in the Concept of 'Straight' in Geometrical and Molecular Models, pp. 19-33
• T. Morikawa: Algebraic Generation of Rational Formulas for Acyclic Chemical Compounds, pp. 35-46
• B. Vidal: A Method to Improve Energies from the Zero Overlap Approximation, pp. 47-50
• G. G. Dyadyusha, M. L. Dekhtyar, M. Y. Kornilov: Inverse Adjacency Matrix and Spectral Properties of Chemical Graphs, pp. 51-63
• M. V. Diudea, B. Parv: Molecular Topology. 3. A New Centric Connectivity Index (CCI), pp. 65-87
• I. Gutman, S. J. Cyvin: Hosoya Index of Fused Molecules, pp. 89-94
• I. Gutman: On the Hosoya Index of Very Large Molecules, pp. 95-103
• V. A. Skorobogatov, A. A. Dobrynin: Metric Analysis of Graphs, pp. 105-151
• V. Elkin: Some Topological Properties of Two Types of S,T-Isomers, pp. 153-162
• B. N. Cyvin, J. Brunvoll, S. J. Cyvin, I. Gutman: All-Benzenoid Systems: Enumeration and Classification of Benzenoid Hydrocarbons. VI, pp. 163-173
• I. Gutman, S. J. Cyvin: All-Benzenoid Systems: Topological Properties of Benzenoid Systems. LVII, pp. 175-178
• R. S. Chen, S. J. Cyvin: The Number of Kekule Structures for Rectangle-Shaped Benzenoids: Part VII, pp. 179-188
• S. J. Cyvin, J. Brunvoll, B. N. Cyvin: Enumeration and Classification of Benzenoid Hydrocarbons. Part VII. Concealed Non-Kekuleans with Hexagonal Symmetry, pp. 189-199
• W. He, W. He, B. N. Cyvin, S. J. Cyvin, J. Brunvoll: There are Exactly Ninety-Eight Concealed Non-Kekulean Benzenoids with Twelve Hexagons. Appendix: Benzenoids with Hexagonal Symmetry and Fourty-Nine Hexagons, pp. 201-207
• J. Brunvoll, B. N. Cyvin, S. J. Cyvin, I. Gutman: Essentially Disconnected Benzenoids: Enumeration and Classification of Benzenoid Hydrocarbons - IX, pp. 209-227
• F. Zhang, X. Guo: The Necessary and Sufficient Conditions for Benzenoid Systems with Small Number of Hexagons to Have Kekule Pattern, pp. 229-238
• J. Brunvoll, S. J. Cyvin, B. N. Cyvin: Essentialy Disconnected Benzenoids: Distribution of K, the Number of Kekule Structures, in Benzenoid Hydrocarbons - VII, pp. 239-243
• K. Schubert: On the Bindings in Two-Component Oxides I. A^{1...5}O_{M} Phases, pp. 245-279
• K. Schubert: On the Bindings in Two-Component Oxides II. A^{6...10}O_{M} Phases, pp. 281-304
• K. Schubert: On the Bindings in Two-Component Oxides III. A^{11...18}O_{M} Phases, pp. 305-326
• K. Schubert: On the Bindings in AN_{M} Phases, pp. 327-340

Book Reviews

• K. D. Sen, C. K. Jorgensen, Electronegativity, Structure and Bonding (Review by K. Jug), pp. 343-344
• S. J. Cyvin, I. Gutman, Kekule Structures in Benzenoid Hydrocarbons (Review by A. T. Balaban), pp. 345-346

Errata, pp. 349-349