%0 Journal Article %A B. V. Fedosov %T On the index of elliptic systems on a manifold with boundary %J Doklady Akademii Nauk %D 1979 %P 1066-1069 %V 248 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a9/ %G ru %F DAN_1979_248_5_a9