no. 2
The spectrum of operators on L p (E n )
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 24 (1970) no. 2, pp. 201-207. 
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     title = {The spectrum of operators on $L^p (E^n)$},
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Schechter, Martin. The spectrum of operators on $L^p (E^n)$. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 24 (1970) no. 2, pp. 201-207. http://archive.numdam.org/item/ASNSP_1970_3_24_2_201_0/

1 Walter Littman, Multipliers in Lp and interpolation, Bull. Amer. Math. Soc. 71 (1965) 764-766. | MR | Zbl

2 Martin Schechter, Partial differential operators on Lp (En), ibid. 75 (1969) 548-549. | MR | Zbl

3 Martin Schechter, The spectra of non-elliptio operators, Israel J. Math. 6 (1968) 384-397. | MR | Zbl

4 F.T. Iha, Spectral theory of partial differential operators, Thesis, University of California, Los Angeles, 1969.

5 F.T. Iha and F.C. Schubert, The spectrucm of partial differential operators on LP (Rn), Trans. Amer. Math. Soc., to appear. | MR | Zbl

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