Nenov, Nedjalko. “A Lower Bound for the Number of Vertices of Some Ramsey Graphs”. Ann. Sofia Univ. Fac. Math. and Inf. 86, no. 1 (December 12, 1994): 11–25. Accessed November 22, 2024. https://ftl5.uni-sofia.bg/index.php/fmi/article/view/430.