@article{DE_1971_7_6_a3,
     author = {S. T. Zavalishchin},
     title = {On the question of the general form of a linear equation. {I,} {II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {981--989},
     publisher = {mathdoc},
     volume = {7},
     number = {6},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_6_a3/}
}