Geodesic
The minimal number of inputs and switching points of boundary value problems with control
Differencialʹnye uravneniâ, Tome 11 (1975) no. 10, pp. 1790-1794 
Yu. K. Lando; V. T. Borukhov; V. K. Boyko. The minimal number of inputs and switching points of boundary value problems with control. Differencialʹnye uravneniâ, Tome 11 (1975) no. 10, pp. 1790-1794. http://geodesic.mathdoc.fr/item/DE_1975_11_10_a7/
@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},
     year = {1975},
     volume = {11},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_10_a7/}
}
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