Geodesic
Elliptic systems on the plane with discontinuous coefficients, and
Doklady Akademii Nauk, Tome 312 (1990) no. 4, pp. 790-795 
A. Dzhuraev. Elliptic systems on the plane with discontinuous coefficients, and. Doklady Akademii Nauk, Tome 312 (1990) no. 4, pp. 790-795. http://geodesic.mathdoc.fr/item/DAN_1990_312_4_a3/
@article{DAN_1990_312_4_a3,
     author = {A. Dzhuraev},
     title = {Elliptic systems on the plane with discontinuous coefficients, and},
     journal = {Doklady Akademii Nauk},
     pages = {790--795},
     year = {1990},
     volume = {312},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_312_4_a3/}
}
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