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@article{DE_1977_13_2_a9, author = {V. M. Isakov}, title = {The inverse problem of potential theory for hyperbolic equations}, journal = {Differencialʹnye uravneni\^a}, pages = {305--313}, publisher = {mathdoc}, volume = {13}, number = {2}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_2_a9/} }
V. M. Isakov. The inverse problem of potential theory for hyperbolic equations. Differencialʹnye uravneniâ, Tome 13 (1977) no. 2, pp. 305-313. http://geodesic.mathdoc.fr/item/DE_1977_13_2_a9/