@article{GDZPPN00243718X,
title = {On Operators with Bounded Imaginary Powers in Banach Spaces.},
journal = {Mathematische Zeitschrift},
volume = {205},
year = {1990},
pages = {429-452},
zbl = {0665.47015},
url = {http://dml.mathdoc.fr/item/GDZPPN00243718X}
}
Sohr, Hermann; Prüss, Jan. On Operators with Bounded Imaginary Powers in Banach Spaces.. Mathematische Zeitschrift, Tome 205 (1990) pp. 429-452. http://gdmltest.u-ga.fr/item/GDZPPN00243718X/