Voir la notice de l'article provenant de la source Math-Net.Ru
@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/} }
D. A. Krupskaya. The regularity of boundary points for second order degenerate elliptic equations. Differencialʹnye uravneniâ, Tome 13 (1977) no. 4, pp. 654-667. http://geodesic.mathdoc.fr/item/DE_1977_13_4_a8/