NENOV, N. A lower bound for the number of vertices of some Ramsey graphs. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 86, n. 1, p. 11–25, 1994. Disponível em: https://admin.uni-sofia.bg/index.php/fmi/article/view/430. Acesso em: 16 jan. 2025.