GRANNELL M.J.; GRIGGS T.S.; QUINN K.A.S.; STANTON R.G. Triple systems with tripoints. Utilitas Mathematica , [S. l.], v. 57, 2000. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/199. Acesso em: 8 may. 2026.