Oka-analyticity of the essential spectrum
Rendiconti del Seminario Matematico della Università di Padova, Tome 79 (1988), pp. 115-121. 
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     author = {Casadio Tarabusi, Enrico},
     title = {Oka-analyticity of the essential spectrum},
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     pages = {115--121},
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     volume = {79},
     year = {1988},
     mrnumber = {964025},
     zbl = {0662.47002},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1988__79__115_0/}
}
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Casadio Tarabusi, Enrico. Oka-analyticity of the essential spectrum. Rendiconti del Seminario Matematico della Università di Padova, Tome 79 (1988), pp. 115-121. http://archive.numdam.org/item/RSMUP_1988__79__115_0/

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