Geodesic
On the problem of the existence of optimal controls
Differencialʹnye uravneniâ, Tome 7 (1971) no. 12, pp. 2161-2167 
B. Mordukhovich. On the problem of the existence of optimal controls. Differencialʹnye uravneniâ, Tome 7 (1971) no. 12, pp. 2161-2167. http://geodesic.mathdoc.fr/item/DE_1971_7_12_a4/
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     author = {B. Mordukhovich},
     title = {On the problem of the existence of optimal controls},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2161--2167},
     year = {1971},
     volume = {7},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_12_a4/}
}
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