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@article{DAN_1957_113_6_a9, author = {A. I. Fet}, title = {Absolute minimum in a two-dimensional parametric problem on a manifold}, journal = {Doklady Akademii Nauk}, pages = {1224--1226}, publisher = {mathdoc}, volume = {113}, number = {6}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a9/} }
A. I. Fet. Absolute minimum in a two-dimensional parametric problem on a manifold. Doklady Akademii Nauk, Tome 113 (1957) no. 6, pp. 1224-1226. http://geodesic.mathdoc.fr/item/DAN_1957_113_6_a9/