@article{DAN_1970_194_5_a7,
     author = {V. A. Oleinikov},
     title = {The differential irreducibility of a linear inhomogeneous equation},
     journal = {Doklady Akademii Nauk},
     pages = {1017--1020},
     year = {1970},
     volume = {194},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_5_a7/}
}