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@article{DAN_1990_311_2_a0, author = {A. A. Agrachev and R. V. Gamkrelidze}, title = {The ``time substitution'' variation in optimal control}, journal = {Doklady Akademii Nauk}, pages = {265--270}, publisher = {mathdoc}, volume = {311}, number = {2}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_2_a0/} }
A. A. Agrachev; R. V. Gamkrelidze. The ``time substitution'' variation in optimal control. Doklady Akademii Nauk, Tome 311 (1990) no. 2, pp. 265-270. http://geodesic.mathdoc.fr/item/DAN_1990_311_2_a0/