ANDRYUSCHENKO, V. A.; ILMAN, V. M.; SHINKARENKO, V. I. The constructive introducing of multigraphs. Science and Transport Progress , [S. l.], n. 36, p. 161–166, 2011. DOI: 10.15802/stp2011/9340. Disponível em: https://stp.ust.edu.ua/article/view/9340. Acesso em: 4 may. 2024.