@article{DE_1974_10_3_a21,
     author = {G. E. Popov},
     title = {A certain method of constructing integrable linear equations with a small parameter},
     journal = {Differencialʹnye uravneni\^a},
     pages = {555--557},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_3_a21/}
}