1.
Nedialkov E, Nenov N. Each 11-vertex graph without 4-cliques has a triangle-free 2-partition of vertices. Ann. Sofia Univ. Fac. Math. and Inf. [Internet]. 1999 Dec. 12 [cited 2024 Nov. 24];91:127-4. Available from: https://ftl5.uni-sofia.bg./index.php/fmi/article/view/275