@article{SM_1989_64_1_a14,
     author = {I. M. Petrushko},
     title = {On boundary values of solutions of elliptic equations degenerating on the boundary},
     journal = {Sbornik. Mathematics},
     pages = {243--262},
     publisher = {mathdoc},
     volume = {64},
     number = {1},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_64_1_a14/}
}