@article{DE_1977_13_4_a8,
     author = {D. A. Krupskaya},
     title = {The regularity of boundary points for second order degenerate elliptic equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {654--667},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_4_a8/}
}