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MR662451 35P20 (35S05 58G15)
Helffer, Bernard; Robert, Didier Propriétés asymptotiques du spectre d'opérateurs pseudodifférentiels sur ${\bf R}\sp{n}$. (French) [Asymptotic properties of the spectrum of pseudodifferential operators on ${\bf R}\sp{n}$] Comm. Partial Differential Equations 7 (1982), no. 7, 795–882.
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