Finite rank, relatively bounded perturbations of semigroups generators
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 12 (1985) no. 4, p. 641-668 
@article{ASNSP_1985_4_12_4_641_0,
     author = {Lasiecka, Irena and Triggiani, Roberto},
     title = {Finite rank, relatively bounded perturbations of semigroups generators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 12},
     number = {4},
     year = {1985},
     pages = {641-668},
     zbl = {0602.47029},
     mrnumber = {848843},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1985_4_12_4_641_0}
}

Finite rank, relatively bounded perturbations of semigroups generators. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 12 (1985) no. 4, pp. 641-668. http://www.numdam.org/item/ASNSP_1985_4_12_4_641_0/

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