LASKAR, RENU C.; VILLALPANDO, JOHN J. Irreducibility of L(2,1)-colorings and the inh-colorability of unicyclic and hex graphs. Utilitas Mathematica , [S. l.], v. 69, 2006. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/448. Acesso em: 8 may. 2026.