1. H. Wiener, J. Amer. Chem. Soc. 69 (1947) 17.
2. H. Wiener, J. Amer. Chem. Soc. 69 (1947) 2636.
3. See, for example, N. Trinajsti? (ed.),Mathematics and Computational Concepts in Chemistry (Ellis Horwood, Chichester, 1986).
4. See, for example, L.B. Kier and L.H. Hall,Molecular Connectivity in Chemistry and Drug Research (Academic Press, New York, 1976).
5. F. Harary,Graph Theory (Addison-Wesley, Reading, 1969).