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@article{FAA_1986_20_2_a1, author = {N. A. Bobylev}, title = {Topological index of extremals of multidimensional variational problems}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {8--13}, publisher = {mathdoc}, volume = {20}, number = {2}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1986_20_2_a1/} }
N. A. Bobylev. Topological index of extremals of multidimensional variational problems. Funkcionalʹnyj analiz i ego priloženiâ, Tome 20 (1986) no. 2, pp. 8-13. http://geodesic.mathdoc.fr/item/FAA_1986_20_2_a1/