%0 Journal Article %A G. V. Demidenko %A I. Yu. Nekhaev %T On the regularity of solutions of boundary value problems for quasi-elliptic equations %J Matematičeskie trudy %D 1994 %P 144-166 %V 24 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_1994_24_a4/ %G ru %F MT_1994_24_a4