@article{DE_1967_3_4_a9,
     author = {A. G. Aslanyan and V. I. Burenkov},
     title = {Refinement of a theorem of {V.} {V.} {Morozov}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {687--691},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_4_a9/}
}