no. 3
Fractional powers of non-densely defined operators
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 18 (1991) no. 3, pp. 443-454. 
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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, Série 4, Tome 18 (1991) no. 3, pp. 443-454. http://www.numdam.org/item/ASNSP_1991_4_18_3_443_0/

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