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@article{DAN_1967_172_1_a3, author = {V. F. Krotov}, title = {Sufficient conditions for the optimality of discrete control systems}, journal = {Doklady Akademii Nauk}, pages = {18--21}, publisher = {mathdoc}, volume = {172}, number = {1}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a3/} }
V. F. Krotov. Sufficient conditions for the optimality of discrete control systems. Doklady Akademii Nauk, Tome 172 (1967) no. 1, pp. 18-21. http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a3/