%0 Journal Article %A V. G. Maz'ya %A S. V. Poborchi %T Extension of functions belonging to S.\,L.~Sobolev spaces into the exterior of a domain with a cusp on the boundary %J Doklady Akademii Nauk %D 1984 %P 1066-1069 %V 275 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1984_275_5_a8/ %G ru %F DAN_1984_275_5_a8