Volume 21 (1986)

Contributions

• R. H. Custer: Mathematical Statements about the Revised CIP-System, pp. 3-31
• A. Graovac, O. E. Polansky: On Hermitian Matrices Associated with the Matching Polynomials of Graphs. Part I. On Some Graphs whose Matching Polynomial is the Characteristic Polynomial of a Hermitian Matrix, pp. 33-45
• O. E. Polansky, A. Graovac: On Hermitian Matrices Associated with the Matching Polynomials of Graphs. Part II. Konstruktion von Gewichtsmatrizen fuer beliebige, mit K_4 homoeomorphe trizyklische Graphen, welche das Matching Polynom des Graphen erzeugen, pp. 47-79
• A. Graovac, O. E. Polansky: On Hermitian Matrices Associated with the Matching Polynomials of Graphs. Part III. The Matching Polynomials of Bicyclic and Tricyclic Cata-Condensed Graphs are the Characteristic Polynomials of Hermitian Matrices with Quaterionic Weights, pp. 81-91
• O. E. Polansky, A. Graovac: On Hermitian Matrices Associated with the Matching Polynomials of Graphs. Part IV. Zur Existenz und Konstruktion von mit dem Matching Polynom assoziierten Gewichtsmatrizen fuer polyzyklische Graphen, pp. 93-113
• A. T. Balaban: Chemical Graphs. Part 48. Topological Index J for Heteroatom-Containing Molecules Taking into Account Periodicities of Element Properties, pp. 115-122
• S. P. Gupta, M. K. Sharma: Molecular Connectivity in Hueckel's Molecular Orbital Theory - II. Parametrization of Resonance Integral, pp. 123-131
• O. E. Polansky, D. Bonchev: The Wiener Number of Graphs. I. General Theory and Changes Due to Some Graph Operations, pp. 133-186
• F. Zhang, Z. Chen: Some Topological Properties of Two Types of S,T-Isomers, pp. 187-194
• J. Cioslowski, M. Wala: Polycyclic Benzenoid Hydrocarbons - The Primary Data Source, pp. 195-258
• R. S. Chen: On the Number of Kekule Structures for Rectangle-Shaped Benzenoids, pp. 259-276
• R. S. Chen: On the Number of Kekule Structures for Rectangle-Shaped Benzenoids - Part II, pp. 277-284
• S. J. Cyvin: Enumeration of Kekule Structures: Triangle-Shaped Benzenoids, pp. 285-289
• B. N. Cyvin, S. J. Cyvin, J. Brunvoll: Enumeration of Kekule Structures: Pentagon-Shaped Benzenoids - Part I, pp. 291-294
• S. J. Cyvin, B. N. Cyvin: Enumeration of Kekule Structures: Pentagon-Shaped Benzenoids - Part II, pp. 295-300
• B. N. Cyvin, J. Brunvoll, S. J. Cyvin: Distribution of K, the Number of Kekule Structures in Benzenoid Hydrocarbons. Part III: Kekule Structure Statistics, pp. 301-315
• I. Gutman: Topological Properties of Benzenoid Systems. XLVIII. Two Contradictory Formulas for Total pi-Electron Energy and Their Reconciliation, pp. 317-324
• E. J. Farrell, J. C. Grell: Cycle Decompositions of Linear Benzene Chains, pp. 325-337

Research Notes

• O. E. Polansky, D. Bonchev: The Minimum Distance Number of Trees, pp. 341-344

Book Review

• I. Gutman, O. E. Polansky, Mathematical Concepts in Organic Chemistry (Review by I. Motoc), pp. 347-347