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@article{DE_1977_13_11_a8, author = {N. N. Petrov}, title = {The correctness of a time-optimality problem}, journal = {Differencialʹnye uravneni\^a}, pages = {1974--1980}, publisher = {mathdoc}, volume = {13}, number = {11}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_11_a8/} }
N. N. Petrov. The correctness of a time-optimality problem. Differencialʹnye uravneniâ, Tome 13 (1977) no. 11, pp. 1974-1980. http://geodesic.mathdoc.fr/item/DE_1977_13_11_a8/