@article{DAN_1981_260_4_a6,
     author = {M. M. Lavrent'ev and E. Yu. Derevtsov and V. A. Sharafutdinov},
     title = {On the determination of an optical body in a homogeneous medium from its images},
     journal = {Doklady Akademii Nauk},
     pages = {799--803},
     publisher = {mathdoc},
     volume = {260},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_4_a6/}
}