@article{DE_1991_27_12_a30,
     author = {V. I. Korobov and G. M. Sklyar},
     title = {Letter to the editors: {``Methods} for constructing positional controls, and a feasible maximum principle'' {[Differentsial'nye} {Uravneniya} \textbf{26} (1990), no. 11, 1914--1924; {MR1092085]}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2201},
     publisher = {mathdoc},
     volume = {27},
     number = {12},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_12_a30/}
}