M-polynomial and neighborhood M-polynomial methods for topological indices of porous grapheneM. C. Shanmukha, A. Usha, K. C. Shilpa and N. S. BasavarajappaEur. Phys. J. Plus, 136 10 (2021) 1089DOI: https://doi.org/10.1140/epjp/s13360-021-02074-8