Bikov, A., & Nenov, N. (2017). LOWER BOUNDING THE FOLKMAN NUMBERS $F_v(a_1, . . . , a_s;m − 1)$. Ann. Sofia Univ. Fac. Math. And Inf., 104, 39–53. Retrieved from https://annual.uni-sofia.bg/index.php/fmi/article/view/36