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@article{DAN_1991_317_1_a0, author = {S. A. Vakhrameev}, title = {The {Morse} index theorem for extremals of some optimal control}, journal = {Doklady Akademii Nauk}, pages = {11--15}, publisher = {mathdoc}, volume = {317}, number = {1}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_1_a0/} }
S. A. Vakhrameev. The Morse index theorem for extremals of some optimal control. Doklady Akademii Nauk, Tome 317 (1991) no. 1, pp. 11-15. http://geodesic.mathdoc.fr/item/DAN_1991_317_1_a0/