Spectral mapping theorem for fractional powers in locally convex spaces
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 24 (1997) no. 4, p. 685-702 
@article{ASNSP_1997_4_24_4_685_0,
     author = {Mart\'\i nez, Celso and Sanz, Miguel},
     title = {Spectral mapping theorem for fractional powers in locally convex spaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 24},
     number = {4},
     year = {1997},
     pages = {685-702},
     zbl = {0910.47012},
     mrnumber = {1627334},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1997_4_24_4_685_0}
}

Martínez, Celso; Sanz, Miguel. Spectral mapping theorem for fractional powers in locally convex spaces. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 24 (1997) no. 4, pp. 685-702. http://www.numdam.org/item/ASNSP_1997_4_24_4_685_0/

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