no. 4
Finite rank, relatively bounded perturbations of semigroups generators
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 12 (1985) no. 4, pp. 641-668. 
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     title = {Finite rank, relatively bounded perturbations of semigroups generators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {641--668},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 12},
     number = {4},
     year = {1985},
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Lasiecka, I.; Triggiani, R. Finite rank, relatively bounded perturbations of semigroups generators. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 12 (1985) no. 4, pp. 641-668. http://archive.numdam.org/item/ASNSP_1985_4_12_4_641_0/

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