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@article{DAN_1963_152_4_a12, author = {F. G. Maslova}, title = {A problem in the spectral theory of differential operators}, journal = {Doklady Akademii Nauk}, pages = {820}, publisher = {mathdoc}, volume = {152}, number = {4}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a12/} }
F. G. Maslova. A problem in the spectral theory of differential operators. Doklady Akademii Nauk, Tome 152 (1963) no. 4. http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a12/