Lower bounds for pseudo-differential operators
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1981-1982), Exposé no. 22, 6 p. 
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     title = {Lower bounds for pseudo-differential operators},
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     note = {talk:22},
     pages = {1--6},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1981-1982},
     language = {en},
     url = {http://archive.numdam.org/item/SEDP_1981-1982____A21_0/}
}
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Fefferman, C.; Phong, D. H. Lower bounds for pseudo-differential operators. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1981-1982), Exposé no. 22, 6 p. http://archive.numdam.org/item/SEDP_1981-1982____A21_0/

[1] C. Fefferman & D.H. Phong: On positivity of pseudo-differential operators, Proc. Natl. Acad. Sc. U.S.A., Vol. 75 (1978), 4673-4674. | MR | Zbl

[2] C. Fefferman & D.H. Phong: The uncertainty principle and sharp Gärding inequalities, Comm. Pure Appl. Math. Vol. 34 (1981), 285-331. | MR | Zbl

[3] C. Fefferman & D.H. Phong: Symplectic geometry and positivity of pseudodifferential operators, Proc. Natl. Acad. Sc. U.S.A., Vol. 79 (1982). | MR | Zbl

[4] C. Fefferman & D.H. Phong: To appear.

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

[6] L. Hörmander: The Weyl calculus for pseudo differential operators, Comm. Pure Appl. Math. Vol. 32, 1979, 359-443. | MR | Zbl