Geodesic
Solvability conditions for the first order elliptic systems on the plane
Eurasian mathematical journal, Tome 3 (2012) no. 1, pp. 139-142.

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Unique solvability conditions are obtained for an elliptic system of two first order real partial differential equations with unbounded coefficients. 
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K. N. Ospanov. Solvability conditions for the first order elliptic systems on the plane. Eurasian mathematical journal, Tome 3 (2012) no. 1, pp. 139-142. http://geodesic.mathdoc.fr/item/EMJ_2012_3_1_a9/

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