@article{DAN_1984_275_5_a8,
     author = {V. G. Maz'ya and S. V. Poborchi},
     title = {Extension of functions belonging to {S.\,L.~Sobolev} spaces into the exterior of a domain with a cusp on the boundary},
     journal = {Doklady Akademii Nauk},
     pages = {1066--1069},
     publisher = {mathdoc},
     volume = {275},
     number = {5},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_275_5_a8/}
}