On the homotopy classification of Douglis--Nirenberg elliptic systems
Doklady Akademii Nauk, Tome 225 (1975) no. 6, pp. 1275-1277.

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     author = {V. I. Shevchenko},
     title = {On the homotopy classification of {Douglis--Nirenberg} elliptic systems},
     journal = {Doklady Akademii Nauk},
     pages = {1275--1277},
     publisher = {mathdoc},
     volume = {225},
     number = {6},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_6_a9/}
}
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V. I. Shevchenko. On the homotopy classification of Douglis--Nirenberg elliptic systems. Doklady Akademii Nauk, Tome 225 (1975) no. 6, pp. 1275-1277. http://geodesic.mathdoc.fr/item/DAN_1975_225_6_a9/