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@article{MAN_1981__256_163493, author = {Shmuel Kantorovitz}, title = {Spectrality {Criteria} for {Unbounded} {Operators} with {Real} {Spectrum.}}, journal = {Mathematische Annalen}, pages = {19--28}, publisher = {mathdoc}, volume = {256}, year = {1981}, zbl = {0459.47022}, url = {http://geodesic.mathdoc.fr/item/MAN_1981__256_163493/} }
Shmuel Kantorovitz. Spectrality Criteria for Unbounded Operators with Real Spectrum.. Mathematische Annalen, Tome 256 (1981), pp. 19-28. http://geodesic.mathdoc.fr/item/MAN_1981__256_163493/