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@article{DE_1973_9_1_a7, author = {V. M. Isakov}, title = {An inverse problem of potential theory for the string equation}, journal = {Differencialʹnye uravneni\^a}, pages = {74--83}, publisher = {mathdoc}, volume = {9}, number = {1}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_1_a7/} }
V. M. Isakov. An inverse problem of potential theory for the string equation. Differencialʹnye uravneniâ, Tome 9 (1973) no. 1, pp. 74-83. http://geodesic.mathdoc.fr/item/DE_1973_9_1_a7/