@article{1195522284,
author = {Yosida, K\^osaku},
title = {A perturbation theorem for semi-groups of linear operators},
journal = {Proc. Japan Acad.},
volume = {41},
number = {9},
year = {1965},
pages = { 645-647},
language = {en},
url = {http://dml.mathdoc.fr/item/1195522284}
}
Yosida, Kôsaku. A perturbation theorem for semi-groups of linear operators. Proc. Japan Acad., Tome 41 (1965) no. 9, pp. 645-647. http://gdmltest.u-ga.fr/item/1195522284/