“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 (December): 5-17. https://annual.uni-sofia.bg/index.php/fmi/article/view/226.