Fractional powers of non-densely defined operators
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 18 (1991) no. 3, pp. 443-454.
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     author = {Martinez, Celso and Sanz, Miguel},
     title = {Fractional powers of non-densely defined operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {443--454},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 18},
     number = {3},
     year = {1991},
     mrnumber = {1145317},
     zbl = {0811.47013},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1991_4_18_3_443_0/}
}
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Martinez, Celso; Sanz, Miguel. Fractional powers of non-densely defined operators. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 18 (1991) no. 3, pp. 443-454. http://archive.numdam.org/item/ASNSP_1991_4_18_3_443_0/

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