Criteria for hypoellipticity
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1986-1987), Exposé no. 15, 12 p. 
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     title = {Criteria for hypoellipticity},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:15},
     pages = {1--12},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1986-1987},
     mrnumber = {920033},
     zbl = {0644.35022},
     language = {en},
     url = {http://archive.numdam.org/item/SEDP_1986-1987____A14_0/}
}
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Morimoto, Y. Criteria for hypoellipticity. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1986-1987), Exposé no. 15, 12 p. http://archive.numdam.org/item/SEDP_1986-1987____A14_0/

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