Ahire, K. S., and R. B. Sawant. “Hyper-Wiener Index, Hyper-Hosoya Polynomial For Tree Of Isomers Of Pentane”. International Journal Of Mathematics And Computer Research, Vol. 4, no. 01, Jan. 2016, pp. 1230-5, https://ijmcr.in/index.php/ijmcr/article/view/22.