The spectrum of operators on L p (E n )
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Volume 24 (1970) no. 2, p. 201-207 
@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, Volume 24 (1970) no. 2, pp. 201-207. http://www.numdam.org/item/ASNSP_1970_3_24_2_201_0/

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6 Erik Balslev, The essential spectrum of elliptic operators in LP (Rn), ibid 116 (1965) 193-217. | MR 190524 | Zbl 0148.09403