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Spectra of partial differential operators. (English) Zbl 0225.35001
North-Holland Series in Applied Mathematics and Mechanics. Vol. 14. Amsterdam-London: North-Holland Publishing Company. XIII, 268 p. Dfl. 58.00; $ 17.00 (1971).

35P05 General topics in linear spectral theory for PDEs
35-02 Research exposition (monographs, survey articles) pertaining to partial differential equations
47F05 General theory of partial differential operators