[1] P. Billingsley, Probability and Measure, John Wiley & Sons, New York, 1885.
[2] Z. Che and Z. Chen, Lower and upper bounds of the forgotten topological index, MATCH Commun. Math. Comput. Chem. 76 (2016) 635–648.
[3] T. Doštlic, T. Réti and D. Vukicevic, On the vertex degree indices of connected graphs, Chem. Phys. Lett. 512 (2011) 283–286.
[4] B. Furtula and I. Gutman, A forgotten topological index, J. Math. Chem. 53 (2015) 1184–1190.
[5] W. Gao, M. R. Farahani and L. Shi, Forgotten topological index of some drug structures, Acta Med. Medit. 32 (2016) 579–585.
[6] I. Gutman and N. Trinajstic, Graph theory and molecular orbitals. Total π-electron energy of alternant hydrocarbons, Chem. Phys. Lett. 17 (1972) 535–538.
[7] R. Kazemi, The eccentric connectivity index of bucket recursive trees, Iranian J. Math. Chem. 5 (2014) 77–83.
[8] Y. C. Sun, Z. Lin, W. X. Peng, T. Q. Yuan, F. Xu, Y. Q. Wu, J. Yang, Y. S. Wang and R. C. Sun, Chemical changes of raw materials and manufactured binderless boards during hot pressing: lignin isolation and characterization,
BioResources 9 (2014) 1055–1071.
)