“An Example of a 16-Vertex Folkman Edge (3,4)-Graph Without 8-Cliques”. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics 98 (December 12, 2008): 127–141. Accessed January 11, 2026. https://annual.uni-sofia.bg/index.php/fmi/article/view/133.