@article{DE_1975_11_10_a7,
     author = {Yu. K. Lando and V. T. Borukhov and V. K. Boyko},
     title = {The minimal number of inputs and switching points of boundary value problems with control},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1790--1794},
     publisher = {mathdoc},
     volume = {11},
     number = {10},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_10_a7/}
}