[1] J. A. Bondy and U. S. R. Murty, Graph Theory with Applications,
MacMillan, New York, NY, 1976.
[2] B. Bollobás and P. Erdös, Graphs with extremal weights, Ars
Combinatorial 50 (1998), 225-233.
[3] Jie Zheng, The general connectivity indices of catacondensed
hexagonal systems, Journal of Mathematical Chemistry 47(3) (2010),
1112-1120.
DOI: https://doi.org/10.1007/s10910-009-9639-9