KHASSAWNEH, B.; NAGY, B. Polynomial and Multinomial Coefficients in Terms of Number of Shortest Paths. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 75, n. 4, p. 495–503, 2022. DOI: 10.7546/CRABS.2022.04.03. Disponível em: http://proceedings.bas.bg/index.php/cr/article/view/58. Acesso em: 24 may. 2022.