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@article{DAN_1979_248_5_a9, author = {B. V. Fedosov}, title = {On the index of elliptic systems on a manifold with boundary}, journal = {Doklady Akademii Nauk}, pages = {1066--1069}, publisher = {mathdoc}, volume = {248}, number = {5}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a9/} }
B. V. Fedosov. On the index of elliptic systems on a manifold with boundary. Doklady Akademii Nauk, Tome 248 (1979) no. 5, pp. 1066-1069. http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a9/