Direct proof of the formula for the index of an elliptic system in euclidean space
Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 4, pp. 83-84.

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     author = {B. V. Fedosov},
     title = {Direct proof of the formula for the index of an elliptic system in euclidean space},
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B. V. Fedosov. Direct proof of the formula for the index of an elliptic system in euclidean space. Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 4, pp. 83-84. http://geodesic.mathdoc.fr/item/FAA_1970_4_4_a14/

[1] Calderon A.P., Proc. Nat. Acad. Sci. USA, 57:5 (1967), 1193–1194 | DOI | MR | Zbl