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@article{DE_1973_9_8_a0, author = {V. G. Boltyanskii}, title = {The support principle in optimal control problems}, journal = {Differencialʹnye uravneni\^a}, pages = {1363--1370}, publisher = {mathdoc}, volume = {9}, number = {8}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_8_a0/} }
V. G. Boltyanskii. The support principle in optimal control problems. Differencialʹnye uravneniâ, Tome 9 (1973) no. 8, pp. 1363-1370. http://geodesic.mathdoc.fr/item/DE_1973_9_8_a0/