@article{ASNSP_1970_3_24_2_201_0, author = {Schechter, Martin}, title = {The spectrum of operators on $L^p (E^n)$}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, publisher = {Scuola normale superiore}, volume = {Ser. 3, 24}, number = {2}, year = {1970}, pages = {201-207}, zbl = {0199.15902}, mrnumber = {267423}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1970_3_24_2_201_0} }
Schechter, Martin. The spectrum of operators on $L^p (E^n)$. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 24 (1970) no. 2, pp. 201-207. http://www.numdam.org/item/ASNSP_1970_3_24_2_201_0/
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and ,6 The essential spectrum of elliptic operators in LP (Rn), ibid 116 (1965) 193-217. | MR 190524 | Zbl 0148.09403
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