LARKI, Farzaneh Nowroozi; PISHEH, Shahram Rayat. On two-sided group digraphs and graphs. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 43, p. 141–152, 2020. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7365. Acesso em: 6 nov. 2026.