@article{TRSPY_1987_180_a60,
     author = {O. V. Epifanov and Yu. F. Korobeinik},
     title = {Normal solvability of linear differential operators of infinite order},
     journal = {Informatics and Automation},
     pages = {110--112},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a60/}
}