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@article{MAN_1977__229_163012, author = {J\"urgen Voigt}, title = {On the {Perturbation} {Theory} for {Strongly} {Continuous} {Semigroups.}}, journal = {Mathematische Annalen}, pages = {163--172}, publisher = {mathdoc}, volume = {229}, year = {1977}, zbl = {0338.47018}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__229_163012/} }
Jürgen Voigt. On the Perturbation Theory for Strongly Continuous Semigroups.. Mathematische Annalen, Tome 229 (1977), pp. 163-172. http://geodesic.mathdoc.fr/item/MAN_1977__229_163012/