@article{SEDP_1986-1987____A14_0, author = {Morimoto, Y.}, title = {Criteria for hypoellipticity}, journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"}, note = {talk:15}, publisher = {Ecole Polytechnique, Centre de Math\'ematiques}, year = {1986-1987}, zbl = {0644.35022}, mrnumber = {920033}, language = {en}, url = {http://archive.numdam.org/item/SEDP_1986-1987____A14_0/} }