%0 Journal Article %A P. I. Lizorkin %A N. V. Miroshin %T Smoothness of the solution of the first boundary value problem for a second-order model degenerate elliptic differential operator %J Differencialʹnye uravneniâ %D 1986 %P 1945-1951 %V 22 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1986_22_11_a11/ %G ru %F DE_1986_22_11_a11