@article{DE_1969_5_3_a9,
     author = {K. G. Val\={e}\={e}v},
     title = {Linear difference equations with exponential coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {499--506},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_3_a9/}
}