1. A. Ali, Z. Raza, A.A. Bhatti, Extremal pentagonal chains with respect to bond incident degree indices. Can. J. Chem. 94, 870–876 (2016)
2. C.D. Godsil, Algebraic Combinatorics (Chapman and Hall, New York, 1993)
3. I. Gutman, The number of perfect matchings in a random hexagonal chain. Gr. Theory Notes N.Y. 16, 26–28 (1989)
4. I. Gutman, Perfect matchings in a class of bipartite graphs. Publ. Inst. Math. (Beograd) 45, 11–15 (1989)
5. I. Gutman, S.J. Cyvin, Introduction to the Theory of Benzenoid Hydrocarbons (Springer, Berlin, 1989)