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@article{MZM_1979_26_1_a4, author = {V. G. Yakhno}, title = {A~converse problem for a~hyperbolic equation}, journal = {Matemati\v{c}eskie zametki}, pages = {39--44}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1979_26_1_a4/} }
V. G. Yakhno. A~converse problem for a~hyperbolic equation. Matematičeskie zametki, Tome 26 (1979) no. 1, pp. 39-44. http://geodesic.mathdoc.fr/item/MZM_1979_26_1_a4/