%0 Journal Article %A S. Z. Levendorskii %T Boundary value problems in a half-space for quasielliptic pseudodifferential operators degenerating on the boundary %J Sbornik. Mathematics %D 1981 %P 429-447 %V 39 %N 4 %U http://geodesic.mathdoc.fr/item/SM_1981_39_4_a0/ %G en %F SM_1981_39_4_a0