Voir la notice de l'article provenant de la source Math-Net.Ru
@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/} }
B. V. Fedosov. On the index of an elliptic operator in $R^n$ and an elliptic boundary- value problem. Doklady Akademii Nauk, Tome 207 (1972) no. 3, pp. 547-550. http://geodesic.mathdoc.fr/item/DAN_1972_207_3_a10/