@article{RSMUP_1988__79__115_0,
     author = {Casadio Tarabusi, Enrico},
     title = {Oka-analyticity of the essential spectrum},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {115--121},
     year = {1988},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {79},
     mrnumber = {964025},
     zbl = {0662.47002},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1988__79__115_0/}
}