@article{SM_2019_210_8_a1,
     author = {A. A. Ershov and A. V. Ushakov and V. N. Ushakov},
     title = {An approach problem for a~control system and a~compact set in the phase space in the presence of phase constraints},
     journal = {Sbornik. Mathematics},
     pages = {1092--1128},
     year = {2019},
     volume = {210},
     number = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2019_210_8_a1/}
}