1. See e.g., (a) and in Applications of Graph Theory, and Eds., Academic Press, London, 1979, pp. 177-221;
2. Applications of graph theory in chemistry
3. Applications of combinatorics and graph theory to spectroscopy and quantum chemistry
4. and in Mathematical and Computational Concepts in Chemistry, Ed., John Wiley & Sons, New York, 1985, pp. 274-282.