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@article{DAN_1979_249_5_a10, author = {S. M. Ponomarev}, title = {On an eigenvalue problem}, journal = {Doklady Akademii Nauk}, pages = {1068--1070}, publisher = {mathdoc}, volume = {249}, number = {5}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_249_5_a10/} }
S. M. Ponomarev. On an eigenvalue problem. Doklady Akademii Nauk, Tome 249 (1979) no. 5, pp. 1068-1070. http://geodesic.mathdoc.fr/item/DAN_1979_249_5_a10/