NILANJAN DE. F-index of graphs based on four operations related to the lexicographic product. Malaya Journal of Matematik, India, v. 8, n. 02, p. 397–404, 2020. DOI: 10.26637/MJM0802/0013. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1414. Acesso em: 16 jul. 2024.