Degree- and irregularity-based molecular descriptors for benzenoid systems Yu-Ming Chu, K. Julietraja, P. Venugopal, Muhammad Kamran Siddiqui and Savari Prabhu Eur. Phys. J. Plus, 136 1 (2021) 78 Published online: 13 January 2021 DOI: 10.1140/epjp/s13360-020-01033-z