“ON THE VERTEX FOLKMAN NUMBERS $F_v(\underbrace{2,. ,2}_R;R-1)$ and $F_v(\underbrace{2,. ,2}_R;R-2)$” (2013) Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, 101, pp. 5–17. Available at: https://annual.uni-sofia.bg/index.php/fmi/article/view/226 (Accessed: 15 December 2025).