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@article{CMH_1981__56_139865, author = {Shmuel Kantorovitz}, title = {Characterization of unbounded spectral operators with spectrum in a half-line.}, journal = {Commentarii mathematici Helvetici}, pages = {163--178}, publisher = {mathdoc}, volume = {56}, year = {1981}, zbl = {0472.47021}, url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139865/} }
Shmuel Kantorovitz. Characterization of unbounded spectral operators with spectrum in a half-line.. Commentarii mathematici Helvetici, Tome 56 (1981), pp. 163-178. http://geodesic.mathdoc.fr/item/CMH_1981__56_139865/