COCKAYNE E.J.; MYNHARDT C.M; SIMMONS J. The CO-irredundant Ramsey number t(4,7). Utilitas Mathematica , [S. l.], v. 57, 2000. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/183. Acesso em: 8 may. 2026.