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@article{MZM_1967_1_3_a15, author = {A. G. Kostyuchenko}, title = {Some spectral properties of differential operators}, journal = {Matemati\v{c}eskie zametki}, pages = {365--378}, publisher = {mathdoc}, volume = {1}, number = {3}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_3_a15/} }
A. G. Kostyuchenko. Some spectral properties of differential operators. Matematičeskie zametki, Tome 1 (1967) no. 3, pp. 365-378. http://geodesic.mathdoc.fr/item/MZM_1967_1_3_a15/