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[1] Kőnig D.: Theorie der endlichen und unendlichen Graphen. Leipzig 1936.
[2] Erdős P.: Extremal problems in graph theory. Proceedings of the Symposium held in Smolenice in June 1963, Publ. H. Czechoslovak Acad. Sc., Prague 1964, 29-36. MR 0180500
[3] Erdős P., Renyi A., Sós V. T.: On a problem of graph theory. Studia Sci. Math, Hung. 1 (1966), 215-235. MR 0223262
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