@article{DE_1982_18_6_a2,
     author = {S. N. Vassilyev},
     title = {The comparison method in systems {analysis.~IV}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {938--947},
     publisher = {mathdoc},
     volume = {18},
     number = {6},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_6_a2/}
}