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@article{DAN_1975_220_5_a0, author = {N. K. Bliev}, title = {On a class of elliptic systems of first-order differential equations}, journal = {Doklady Akademii Nauk}, pages = {1001--1003}, publisher = {mathdoc}, volume = {220}, number = {5}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_220_5_a0/} }
N. K. Bliev. On a class of elliptic systems of first-order differential equations. Doklady Akademii Nauk, Tome 220 (1975) no. 5, pp. 1001-1003. http://geodesic.mathdoc.fr/item/DAN_1975_220_5_a0/