L. Bytautas, D. Klein, M. Randic, and T. Pisanski. Discrete Mathematical Chemistry, volume 51 of DIMACS Series in Discrete Mathematics and Theoretical Computer Science, page 39-61. DIMACS/AMS, (1998)
M. Randic, X. Guo, and S. Bobst. Discrete Mathematical Chemistry, volume 51 of DIMACS Series in Discrete Mathematics and Theoretical Computer Science, page 305-322. DIMACS/AMS, (1998)
X. Guo, and M. Randic. Discrete Mathematical Chemistry, volume 51 of DIMACS Series in Discrete Mathematics and Theoretical Computer Science, page 189-197. DIMACS/AMS, (1998)