Nenov, Nedjalko. “On the (3,4)-Ramsey Graphs Without 9-Cliques”. Ann. Sofia Univ. Fac. Math. and Inf. 85 (December 12, 1993): 71–81. Accessed November 24, 2024. https://ftl5.uni-sofia.bg./index.php/fmi/article/view/456.