NENOV, N. On the (3,4)-Ramsey graphs without 9-cliques. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 85, p. 71–81, 1993. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/456. Acesso em: 13 apr. 2025.