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@article{DAN_1991_320_4_a10, author = {I. V. Skrypnik}, title = {A condition for the regularity of a boundary point for a}, journal = {Doklady Akademii Nauk}, pages = {821--824}, publisher = {mathdoc}, volume = {320}, number = {4}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_4_a10/} }
I. V. Skrypnik. A condition for the regularity of a boundary point for a. Doklady Akademii Nauk, Tome 320 (1991) no. 4, pp. 821-824. http://geodesic.mathdoc.fr/item/DAN_1991_320_4_a10/