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@article{DAN_1983_269_6_a7, author = {M. M. Lavrent'ev and V. S. Ladyzhets}, title = {An inverse problem of geometric optics}, journal = {Doklady Akademii Nauk}, pages = {1313--1315}, publisher = {mathdoc}, volume = {269}, number = {6}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_269_6_a7/} }
M. M. Lavrent'ev; V. S. Ladyzhets. An inverse problem of geometric optics. Doklady Akademii Nauk, Tome 269 (1983) no. 6, pp. 1313-1315. http://geodesic.mathdoc.fr/item/DAN_1983_269_6_a7/