FRICK, MARIETJIE; FRICKE, GERD H.; MYNHARDT, CHRISTINA M.; SKAGGS, R. DUANE. Critical graphs with respect to vertex identification. Utilitas Mathematica , [S. l.], v. 76, 2008. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/560. Acesso em: 8 may. 2026.