@article{DE_1992_28_6_a2,
     author = {S. V. Bogatyrev and L. M. Fridman},
     title = {Singular correction of the method of equivalent control},
     journal = {Differencialʹnye uravneni\^a},
     pages = {930--943},
     publisher = {mathdoc},
     volume = {28},
     number = {6},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_6_a2/}
}