@article{SM_1981_39_4_a0,
     author = {S. Z. Levendorskii},
     title = {Boundary value problems in a~half-space for quasielliptic pseudodifferential operators degenerating on the boundary},
     journal = {Sbornik. Mathematics},
     pages = {429--447},
     year = {1981},
     volume = {39},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1981_39_4_a0/}
}