@article{DAN_1972_207_3_a10,
     author = {B. V. Fedosov},
     title = {On the index of an elliptic operator in $R^n$ and an elliptic boundary- value problem},
     journal = {Doklady Akademii Nauk},
     pages = {547--550},
     publisher = {mathdoc},
     volume = {207},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_3_a10/}
}