Geodesic
The geometric meaning of the condition of ellipticity of a system of first order differential equations in the plane and its reduction to a complex special form
Doklady Akademii Nauk, Tome 260 (1981) no. 5, pp. 1043-1046.

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     author = {V. S. Vinogradov},
     title = {The geometric meaning of the condition of ellipticity of a system of first order differential equations in the plane and its reduction to a complex special form},
     journal = {Doklady Akademii Nauk},
     pages = {1043--1046},
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     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_5_a3/}
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V. S. Vinogradov. The geometric meaning of the condition of ellipticity of a system of first order differential equations in the plane and its reduction to a complex special form. Doklady Akademii Nauk, Tome 260 (1981) no. 5, pp. 1043-1046. http://geodesic.mathdoc.fr/item/DAN_1981_260_5_a3/