@article{GDZPPN002064235,
title = {Characterization of unbounded spectral operators with spectrum in a half-line.},
journal = {Commentarii mathematici Helvetici},
volume = {56},
year = {1981},
pages = {163-178},
zbl = {0472.47021},
url = {http://dml.mathdoc.fr/item/GDZPPN002064235}
}
Kantorovitz, Shmuel. Characterization of unbounded spectral operators with spectrum in a half-line.. Commentarii mathematici Helvetici, Tome 56 (1981) pp. 163-178. http://gdmltest.u-ga.fr/item/GDZPPN002064235/