MathSciNet bibliographic data

MR648064 (83f:35108) 35S05 (47G05) Fefferman, C.; Phong, D. H. Symplectic geometry and positivity of pseudodifferential operators. Proc. Nat. Acad. Sci. U.S.A. 79 (1982), no. 2, 710--713.

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