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@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/} }
I. A. Kipriyanov. A certain class of singular elliptic operators. I. Differencialʹnye uravneniâ, Tome 7 (1971) no. 11, pp. 2066-2077. http://geodesic.mathdoc.fr/item/DE_1971_7_11_a15/