@article{DE_1979_15_12_a19,
     author = {A. E. Gur'yanov},
     title = {Inversion of a linear nonstationary system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2269--2270},
     publisher = {mathdoc},
     volume = {15},
     number = {12},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_12_a19/}
}