COCKAYNE E.J.; GELDCNHUYS G.; GROBLER P.J.P.; MYNHARDT C.M.; VAN VUUREN J.H. The depression of a graph. Utilitas Mathematica , [S. l.], v. 69, 2006. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/439. Acesso em: 8 may. 2026.