@article{JEDP_1975____183_0, author = {Grigis, Alain}, title = {Hypoellipticit\'e et param\'etrix pour des op\'erateurs pseudodiff\'erentiels \`a caract\'eristiques doubles}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, year = {1975}, pages = {183-205}, language = {fr}, url = {http://dml.mathdoc.fr/item/JEDP_1975____183_0} }
Grigis, Alain. Hypoellipticité et paramétrix pour des opérateurs pseudodifférentiels à caractéristiques doubles. Journées équations aux dérivées partielles, (1975), pp. 183-205. http://gdmltest.u-ga.fr/item/JEDP_1975____183_0/
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