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@article{DAN_1964_155_4_a13, author = {A. V. Strauss}, title = {On the multiplicity of the spectrum of a self-adjoint ordinary differential operator}, journal = {Doklady Akademii Nauk}, pages = {771--774}, publisher = {mathdoc}, volume = {155}, number = {4}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_4_a13/} }
A. V. Strauss. On the multiplicity of the spectrum of a self-adjoint ordinary differential operator. Doklady Akademii Nauk, Tome 155 (1964) no. 4, pp. 771-774. http://geodesic.mathdoc.fr/item/DAN_1964_155_4_a13/