ABSTRACT
These indices introduced by Randié [130] have today become known as the set of molecular connectivity indices. The indices have been more widely used than any of the other topdogical indices put forward to date. The implications of these indices range from correlations of the physical to the bido^cal properties of chemical species. Two monographs by Kier and Hall [132,133] have been devoted sdely to discussion of the manifold uses of these indices; a review by Rouvray [134] has focused on the major biological applications. A number of reviews that have treated the applications of topolo^cal indices in general have included substantial material on the mdecular connectivity indices. Reviews that are very helpful in this regard are those of Balaban et al [135], Sabljié and Tkinajstié [136], Basak et al [137], and Rouvray [138]. Further information can also be obtained from the books of lUnajstié [62] and Bonchev [139]. Although over 100 different topological indices have been proposed up to the present, only a handful of them have so far found widespread use.
