[1] P. Erdös J. Spencer: Probabilistic Methods in Combinatorics. Akademiai Kiadó, Budapest 1974. MR 0382007

[2] D. L. Greenwell R. L. Hemminger, J.Kleitman: Forbidden Subgraphs. Proc. 4-th S-E Conf. Graph Th. and Computing, Florida Atlantic University (1973), 389-394. MR 0354446

[3] M. Hall, Jr.: Combinatorial Theory. Blaisdell Publ. Соmр., Waltham (Massachusetts), Toronto, London 1967. MR 0224481 | Zbl 0196.02401

[4] J. Spencer: Ramsey's Theorem - A New Lower Bound. Journal of Comb. Th. A 18 (1975), 108-115. DOI 10.1016/0097-3165(75)90071-0 | MR 0366726 | Zbl 0296.05003

[5] J. Yackel: Inequalities and Asymptotic Bounds for Ramsey Numbers. Journal of Comb. Th. 13 (1972), 56-58. DOI 10.1016/0095-8956(72)90008-1 | MR 0304235 | Zbl 0219.05004