Aruvi M, Joseph JM, Ramganesh E. Four New Sums of Second Hyper Zagreb Index Based on Cartesian Product. Comm. Math. Appl. [Internet]. 2021 Jun. 30 [cited 2025 Aug. 18];12(2):253-62. Available from: https://www.journals.rgnpublications.com/index.php/cma/article/view/1462