BRIGHAM, ROBERT C.; CHARTRAND, GARY; DUTTON, RONALD D.; ZHANG, PING. On induced subdigraphs of certain distance-defined digraphs. Utilitas Mathematica , [S. l.], v. 68, 2005. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/366. Acesso em: 3 feb. 2026.