@article{DE_1968_4_3_a2,
     author = {Yu. P. Krivenkov},
     title = {Linear optimal processes with unbounded control. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {409--422},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_3_a2/}
}