@article{DAN_1984_274_5_a2,
     author = {I. V. Skrypnik},
     title = {A criterion for regularity of a boundary point for quasilinear},
     journal = {Doklady Akademii Nauk},
     pages = {1040--1044},
     publisher = {mathdoc},
     volume = {274},
     number = {5},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_274_5_a2/}
}