Geodesic
Perturbation theorems for convoluted $C$-semigroups and cosine functions
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 35 (2010) no. 1.

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

In this paper, we prove several different types of additive perturbation theorems for (local) convoluted $C$-semigroups and cosine functions. 
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     title = {Perturbation theorems for convoluted $C$-semigroups and cosine functions},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
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M. Kostić. Perturbation theorems for convoluted $C$-semigroups and cosine functions. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 35 (2010) no. 1. http://geodesic.mathdoc.fr/item/BASS_2010_35_1_a2/