@article{DE_1978_14_11_a4,
     author = {N. I. Nagnibida and N. P. Oliinyk},
     title = {Equivalence of some second-order differential operators in a space of entire functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1990--1996},
     publisher = {mathdoc},
     volume = {14},
     number = {11},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_11_a4/}
}