Geodesic
Elliptic systems of Beltrami type and tomography problems
Doklady Akademii Nauk, Tome 315 (1990) no. 1, pp. 15-19 
A. L. Bukhgeim; S. G. Kazantsev. Elliptic systems of Beltrami type and tomography problems. Doklady Akademii Nauk, Tome 315 (1990) no. 1, pp. 15-19. http://geodesic.mathdoc.fr/item/DAN_1990_315_1_a1/
@article{DAN_1990_315_1_a1,
     author = {A. L. Bukhgeim and S. G. Kazantsev},
     title = {Elliptic systems of {Beltrami} type and tomography problems},
     journal = {Doklady Akademii Nauk},
     pages = {15--19},
     year = {1990},
     volume = {315},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_1_a1/}
}
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