no. 2
On relatively bounded perturbations of linear C 0 -semigroups
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 11 (1984) no. 2, pp. 327-341. 
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     title = {On relatively bounded perturbations of linear $C_0$-semigroups},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {327--341},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 11},
     number = {2},
     year = {1984},
     mrnumber = {764949},
     zbl = {0556.47022},
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     url = {http://www.numdam.org/item/ASNSP_1984_4_11_2_327_0/}
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Desch, W.; Schappacher, W. On relatively bounded perturbations of linear $C_0$-semigroups. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 11 (1984) no. 2, pp. 327-341. http://www.numdam.org/item/ASNSP_1984_4_11_2_327_0/

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