Pseudo-differential operators with symbols admitting negative values
Journées équations aux dérivées partielles (1981), article no. 10, 6 p. 
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     author = {Charles Fefferman and D. H. Phong},
     title = {Pseudo-differential operators with symbols admitting negative values},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--6},
     publisher = {\'Ecole polytechnique},
     year = {1981},
     zbl = {0482.35081},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1981____A10_0/}
}
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Charles Fefferman; D. H. Phong. Pseudo-differential operators with symbols admitting negative values. Journées équations aux dérivées partielles (1981), article  no. 10, 6 p. https://proceedings.centre-mersenne.org/item/JEDP_1981____A10_0/

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