@article{DE_1990_26_11_a9,
     author = {V. A. Komarov},
     title = {Necessary and sufficient conditions for optimality in a time-optimality problem with phase constraints},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1906--1913},
     publisher = {mathdoc},
     volume = {26},
     number = {11},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_11_a9/}
}