@article{DAN_1976_230_2_a9,
     author = {B. Yu. Sternin},
     title = {Relative elliptic theory and the {S.\,L.~Sobolev} problem},
     journal = {Doklady Akademii Nauk},
     pages = {287--290},
     publisher = {mathdoc},
     volume = {230},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_2_a9/}
}