Voir la notice de l'article provenant de la source Math-Net.Ru
@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}, publisher = {mathdoc}, volume = {315}, number = {1}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_1_a1/} }
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/