“ON THE VERTEX FOLKMAN NUMBERS $F_v(\underbrace{2,. ,2}_R;R-1)$ and $F_v(\underbrace{2,. ,2}_R;R-2)$”. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics 101 (December 12, 2013): 5–17. Accessed December 15, 2025. https://annual.uni-sofia.bg/index.php/fmi/article/view/226.