@article{DAN_1971_200_5_a5,
     author = {V. G. Limanskii},
     title = {Comparison theorems for some differential operator equations},
     journal = {Doklady Akademii Nauk},
     pages = {1030--1033},
     publisher = {mathdoc},
     volume = {200},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_5_a5/}
}