@article{DE_1990_26_4_a7,
     author = {V. P. Serov and A. G. Chentsov},
     title = {On a construction of an extension of a control problem with integral constraints},
     journal = {Differencialʹnye uravneni\^a},
     pages = {607--618},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a7/}
}