@article{DE_1971_7_11_a15,
     author = {I. A. Kipriyanov},
     title = {A certain class of singular elliptic operators. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2066--2077},
     publisher = {mathdoc},
     volume = {7},
     number = {11},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_11_a15/}
}