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@article{DAN_1973_211_1_a13, author = {M. M. Khrustalev}, title = {Necessary and sufficient conditions for an optimal control problem}, journal = {Doklady Akademii Nauk}, pages = {59--62}, publisher = {mathdoc}, volume = {211}, number = {1}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_1_a13/} }
M. M. Khrustalev. Necessary and sufficient conditions for an optimal control problem. Doklady Akademii Nauk, Tome 211 (1973) no. 1, pp. 59-62. http://geodesic.mathdoc.fr/item/DAN_1973_211_1_a13/