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@article{DAN_1964_158_1_a5, author = {M. M. Gekhtman and I. V. Stankevich}, title = {On the spectrum of non-selfadjoint differential operators}, journal = {Doklady Akademii Nauk}, pages = {29--32}, publisher = {mathdoc}, volume = {158}, number = {1}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a5/} }
M. M. Gekhtman; I. V. Stankevich. On the spectrum of non-selfadjoint differential operators. Doklady Akademii Nauk, Tome 158 (1964) no. 1, pp. 29-32. http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a5/