@article{DE_1986_22_2_a7,
     author = {S. K. Norkin},
     title = {On the asymptotics and structure of the integral $O$-set of a singular system. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {228--236},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_2_a7/}
}