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@article{DAN_1967_174_1_a8, author = {B. T. Polyak}, title = {A general method for solving extremal problems}, journal = {Doklady Akademii Nauk}, pages = {33--36}, publisher = {mathdoc}, volume = {174}, number = {1}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_174_1_a8/} }
B. T. Polyak. A general method for solving extremal problems. Doklady Akademii Nauk, Tome 174 (1967) no. 1, pp. 33-36. http://geodesic.mathdoc.fr/item/DAN_1967_174_1_a8/