@article{SM_1971_13_3_a3,
     author = {Yu. F. Korobeinik and O. V. Epifanov},
     title = {Normal solvability of a~class of differential equations of infinite order},
     journal = {Sbornik. Mathematics},
     pages = {371--399},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_13_3_a3/}
}