Fractional powers of elliptic differential operators
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Serie 3, Volume 22 (1968) no. 1, pp. 113-132.
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     author = {Burak, Tamar},
     title = {Fractional powers of elliptic differential operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {113--132},
     publisher = {Scuola normale superiore},
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     number = {1},
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     zbl = {0159.15601},
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     url = {http://archive.numdam.org/item/ASNSP_1968_3_22_1_113_0/}
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Burak, Tamar. Fractional powers of elliptic differential operators. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Serie 3, Volume 22 (1968) no. 1, pp. 113-132. http://archive.numdam.org/item/ASNSP_1968_3_22_1_113_0/

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