title: Algebraic Kekulé structures of benzenoid hydrocarbons.
abstract: An algebraic Kekulé structure of a benzenoid hydrocarbon is obtained from an ordinary Kekulé structure by inscribing into each hexagon the number of pi-electrons which (according to this Kekulé structure) belong to this hexagon. We show that in the case of catafusenes, there is a one-to-one correspondence between ordinary and algebraic Kekulé structures. On the other hand, in the case of perifusenes, one algebraic Kekulé structure may correspond to several ordinary Kekulé structures.
authors.affiliation: Faculty of Science, University of Kragujevac, P.O. Box 60, 34000 Kragujevac, Serbia and Montenegro.
authors.forename: Ivan
authors.initials: I
authors.lastname: Gutman
authors.forename: Damir
authors.initials: D
authors.lastname: Vukicević
authors.forename: Ante
authors.initials: A
authors.lastname: Graovac
authors.forename: Milan
authors.initials: M
authors.lastname: Randić