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@article{DE_1973_9_3_a25, author = {A. I. Kalinin}, title = {Necessary optimality conditions for singular controls}, journal = {Differencialʹnye uravneni\^a}, pages = {568--573}, publisher = {mathdoc}, volume = {9}, number = {3}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_3_a25/} }
A. I. Kalinin. Necessary optimality conditions for singular controls. Differencialʹnye uravneniâ, Tome 9 (1973) no. 3, pp. 568-573. http://geodesic.mathdoc.fr/item/DE_1973_9_3_a25/