@article{DAN_1978_238_6_a8,
     author = {Ya. A. Roitberg},
     title = {On limiting values on surfaces, parallel to the boundary, of generalized solutions of elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1303--1306},
     year = {1978},
     volume = {238},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_238_6_a8/}
}