Hyper-Zagreb index of graphs based on generalized subdivision related operationsHyper-Zagreb index of graphs based on generalized subdivision related operations. Punjab Univ. J. Math. [Internet]. 2025 May 15 [cited 2025 Jun. 29];52(5):89-103. Available from: https://pujm.pu.edu.pk/index.php/pujm/article/view/348