%0 Journal Article %A A. I. Achildiev %T Charateristic functions of the first boundary value problem for elĀ­liptic equations degenerating at certain points %J Doklady Akademii Nauk %D 1969 %P 1207-1209 %V 188 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1969_188_6_a0/ %G ru %F DAN_1969_188_6_a0