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[1] Katona, Nemetz, Simonowits: On a problem of Turan in the theory of graphs. Mat. Lapok 15, 64, 228-238. MR 0172263
[2] G. Ringel: On extremal problems in graph theory. in Proceedings of the Symp. held in Smolenice 1963, ČSAV Praha.
[3] J. Surányi: written communication to the author, 1973.
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