@article{GDZPPN002304988,
title = {Spectral Properties of a Linear Operator Connected with Solutions of Linear Differential Equations in Banach Spaces.},
journal = {Mathematische Annalen},
volume = {193},
year = {1971},
pages = {253-256},
zbl = {0206.13803},
url = {http://dml.mathdoc.fr/item/GDZPPN002304988}
}
WELCH, John N. Spectral Properties of a Linear Operator Connected with Solutions of Linear Differential Equations in Banach Spaces.. Mathematische Annalen, Tome 193 (1971) pp. 253-256. http://gdmltest.u-ga.fr/item/GDZPPN002304988/