CHARTRAND, GARY; HENNING, MICHAEL A.; JARRETT, ELZBIETA B.; WALL, CURTISS E. Quadrilateral line graphs. Utilitas Mathematica , [S. l.], v. 50, 1996. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/23. Acesso em: 8 may. 2026.