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@article{DAN_1988_298_6_a0, author = {E. R. Avakov}, title = {The maximum principle for abnormal optimal control problems}, journal = {Doklady Akademii Nauk}, pages = {1289--1292}, publisher = {mathdoc}, volume = {298}, number = {6}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_6_a0/} }
E. R. Avakov. The maximum principle for abnormal optimal control problems. Doklady Akademii Nauk, Tome 298 (1988) no. 6, pp. 1289-1292. http://geodesic.mathdoc.fr/item/DAN_1988_298_6_a0/