Geodesic
The existence of mappings on the plane for degenerate first order elliptic systems
Doklady Akademii Nauk, Tome 191 (1970) no. 3, pp. 526-529.

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@article{DAN_1970_191_3_a6,
     author = {I. S. Ovchinnikov},
     title = {The existence of mappings on the plane for degenerate first order elliptic systems},
     journal = {Doklady Akademii Nauk},
     pages = {526--529},
     publisher = {mathdoc},
     volume = {191},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_191_3_a6/}
}
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I. S. Ovchinnikov. The existence of mappings on the plane for degenerate first order elliptic systems. Doklady Akademii Nauk, Tome 191 (1970) no. 3, pp. 526-529. http://geodesic.mathdoc.fr/item/DAN_1970_191_3_a6/