Advances in the theory of benzenoid hydrocarbons

1. I. Gutman, Kragujevac/Yugpslavia Topological Properties of Benzenoid Systems 2. I. Gutman, Kragujevac/Yugoslavia Total Pi-Electron of Benzenoid Hydrocarbons 3. B.N. Cyvin, J. Brunvoll, S.J. Cyvin, Trondheim/Norway Benzenoid Chemical Isomers and Their Enumeration 4. B.N. Cyvin, J. Brunvoll, S.J. Cyvin, Trondheim/Norway Enumeration of Benzenoid Systems and Other Polyhexes