@article{JEDP_1981____A10_0,
author = {Fefferman, Charles Louis and Phong, D. H.},
title = {Pseudo-differential operators with symbols admitting negative values},
journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
year = {1981},
pages = {1-6},
zbl = {0482.35081},
language = {en},
url = {http://dml.mathdoc.fr/item/JEDP_1981____A10_0}
}
Fefferman, Charles; Phong, D. H. Pseudo-differential operators with symbols admitting negative values. Journées équations aux dérivées partielles, (1981), pp. 1-6. http://gdmltest.u-ga.fr/item/JEDP_1981____A10_0/
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