Pseudo-differential operators with symbols admitting negative values
Journées équations aux dérivées partielles (1981), article no. 10, 6 p. 
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     author = {Fefferman, Charles and Phong, D. H.},
     title = {Pseudo-differential operators with symbols admitting negative values},
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     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
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     publisher = {Ecole polytechnique},
     year = {1981},
     zbl = {0482.35081},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1981____A10_0/}
}
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Fefferman, Charles; Phong, D. H. Pseudo-differential operators with symbols admitting negative values. Journées équations aux dérivées partielles (1981), article  no. 10, 6 p. http://archive.numdam.org/item/JEDP_1981____A10_0/

[1] Beals, R. and C. Fefferman, Spatially inhomogeneous pseudo-differential operator Comm. Pure Appl. Math. 1974, Vol. 27, pp. 1-24. | Zbl

[2] Fefferman, C. and D. H. Phong, On positivity of pseudo-differential operators, Proc. Nat. Acad. Sci. U.S.A. Vol 75, 1978, pp. 4673-4674. | MR | Zbl

[3] Fefferman, C. and D. H. Phong, The uncertainty principle and sharp Gårding inequalities, Comm. Pure Appl. Math. Vol. 34, 1981, pp. 285-331. | MR | Zbl

[4] Fefferman, C. and D. H. Phong, On the asymptotic eigenvalue distribution of a pseudo-differential operator, Proc. Nat. Acad. Sci. U.S.A. 1980, Vol. 77. | MR | Zbl

[5] Fefferman, C. and D. H. Phong, Pseudo-differential operators with positive symbols, Séminaire Goulaouic-Meyer-Schwartz, Ecole Polytechnique, 1981. | Numdam | Zbl

[6] Fefferman, C. and D. H. Phong, To appear in Proceedings of Conference in Harmonic analysis, Chicago, 1981.

[7] Hörmander, L., The Weyl calculus of pseudo-differential operators, Comm. Pure Appl. Math. Vol. 32, 1979, pp. 359-443. | Zbl

[8] Melin, A., Lower bounds for pseudo-differential operators, Arkiv för Mat. Vol. 9 1971, pp. 117-140. | MR | Zbl