ON THE VERTEX FOLKMAN NUMBERS $F_v(\underbrace{2,.,2}_R;R-1)$ and $F_v(\underbrace{2,.,2}_R;R-2)$. Ann. Sofia Univ. Fac. Math. and Inf. 2013;101:5-17. Accessed December 15, 2025. https://annual.uni-sofia.bg/index.php/fmi/article/view/226