1. Diestel, R.: Graph Theory, Springer-Verlag, Berlin, Heildeberg, 2005
2. Turán, P.: On an extremal problem in graph theory. Mat. Fiz. Lapok, 48, 436–452 (1941)
3. Bollobás, B.: Extremal Graph Theory, Academic Press, New York, 1978
4. Simonovits, M.: Extremal Graph Theory, Selected Topics in Graph Theory, 2, Academic Press, London, 1983, 161–200
5. Mader, W.: 3n − 5 edges do force a subdivision of K 5. Combinatorica, 18(4), 569–595 (1998)