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β€œON 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., vol. 101, pp. 5–17, Dec. 2013, Accessed: Feb. 04, 2026. [Online]. Available: https://annual.uni-sofia.bg/index.php/fmi/article/view/226