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@article{DAN_1975_222_1_a9, author = {\`E. M. Saak}, title = {On the theory of multidimensional elliptic systems of first order}, journal = {Doklady Akademii Nauk}, pages = {43--46}, publisher = {mathdoc}, volume = {222}, number = {1}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_222_1_a9/} }
È. M. Saak. On the theory of multidimensional elliptic systems of first order. Doklady Akademii Nauk, Tome 222 (1975) no. 1, pp. 43-46. http://geodesic.mathdoc.fr/item/DAN_1975_222_1_a9/