Geodesic
The quadratic form method in the combinatorial Turan problem
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1982), pp. 3-6 
A. F. Sidorenko. The quadratic form method in the combinatorial Turan problem. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1982), pp. 3-6. http://geodesic.mathdoc.fr/item/VMUMM_1982_1_a0/
@article{VMUMM_1982_1_a0,
     author = {A. F. Sidorenko},
     title = {The quadratic form method in the combinatorial {Turan} problem},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--6},
     year = {1982},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_1_a0/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A new method is described for obtaining lower bounds in the Turan problem and other extremal combinatorial problems.