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@article{IM2_1974_8_3_a9, author = {V. I. Blagodatskikh}, title = {Sufficient optimality conditions for differential imbeddings}, journal = {Izvestiya. Mathematics }, pages = {621--630}, publisher = {mathdoc}, volume = {8}, number = {3}, year = {1974}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1974_8_3_a9/} }
V. I. Blagodatskikh. Sufficient optimality conditions for differential imbeddings. Izvestiya. Mathematics , Tome 8 (1974) no. 3, pp. 621-630. http://geodesic.mathdoc.fr/item/IM2_1974_8_3_a9/