FARRELL E.J.; WAHID S.A. D-graphs II: Constructions of D-graphs for some families of graphs with even cycles. Utilitas Mathematica , [S. l.], v. 56, 1999. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/127. Acesso em: 8 may. 2026.