Arockiaraj, Micheal, Liu, Jia-Bao, Prabhu S., and Arulperumjothi M. “On the Zagreb and Wiener Polarity Indices of C3-Free Chemical Nanostructures”. Utilitas Mathematica, vol. 115, June 2020, https://utilitasmathematica.com/index.php/Index/article/view/1484.