@article{DE_1974_10_5_a8,
     author = {A. A. Reinfeld},
     title = {A reduction theorem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {838--843},
     publisher = {mathdoc},
     volume = {10},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_5_a8/}
}