@article{GDZPPN002314533, title = {On the Perturbation Theory for Strongly Continuous Semigroups.}, journal = {Mathematische Annalen}, volume = {229}, year = {1977}, pages = {163-172}, zbl = {0338.47018}, url = {http://dml.mathdoc.fr/item/GDZPPN002314533} }
Voigt, Jürgen. On the Perturbation Theory for Strongly Continuous Semigroups.. Mathematische Annalen, Tome 229 (1977) pp. 163-172. http://gdmltest.u-ga.fr/item/GDZPPN002314533/