Kolev, N., and N. Nenov. “An Example of a 16-Vertex Folkman Edge (3,4)-Graph Without 8-Cliques”. Ann. Sofia Univ. Fac. Math. And Inf., vol. 98, Dec. 2008, pp. 127-41, https://ftl5.uni-sofia.bg/index.php/fmi/article/view/133.