@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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