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@article{DAN_1962_145_3_a11, author = {Z. I. Leibenzon}, title = {The relation between the inverse problem and the completeness of eigenfunctions}, journal = {Doklady Akademii Nauk}, pages = {519--522}, publisher = {mathdoc}, volume = {145}, number = {3}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_145_3_a11/} }
Z. I. Leibenzon. The relation between the inverse problem and the completeness of eigenfunctions. Doklady Akademii Nauk, Tome 145 (1962) no. 3, pp. 519-522. http://geodesic.mathdoc.fr/item/DAN_1962_145_3_a11/