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@article{DAN_1989_307_4_a2, author = {N. A. Bobylev and M. A. Krasnosel'skii}, title = {Normal deformations of variational problems}, journal = {Doklady Akademii Nauk}, pages = {785--788}, publisher = {mathdoc}, volume = {307}, number = {4}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_4_a2/} }
N. A. Bobylev; M. A. Krasnosel'skii. Normal deformations of variational problems. Doklady Akademii Nauk, Tome 307 (1989) no. 4, pp. 785-788. http://geodesic.mathdoc.fr/item/DAN_1989_307_4_a2/