@article{DE_1986_22_3_a9,
     author = {I. T. Skorodinskii},
     title = {A necessary condition for optimality for multidimensional singular control},
     journal = {Differencialʹnye uravneni\^a},
     pages = {435--439},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_3_a9/}
}