@article{DE_1990_26_2_a5,
     author = {Yu. N. Kiselev},
     title = {Optimal design in a smooth linear time-optimality problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {232--237},
     year = {1990},
     volume = {26},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_2_a5/}
}