Hypoelliptic operators with characteristic variety of codimension two and the wave equation
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1979-1980), Talk no. 11, 12 p.
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     title = {Hypoelliptic operators with characteristic variety of codimension two and the wave equation},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
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     pages = {1--12},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1979-1980},
     mrnumber = {600696},
     zbl = {0468.35032},
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     url = {http://archive.numdam.org/item/SEDP_1979-1980____A12_0/}
}
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Melrose, R. B. Hypoelliptic operators with characteristic variety of codimension two and the wave equation. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1979-1980), Talk no. 11, 12 p. http://archive.numdam.org/item/SEDP_1979-1980____A12_0/

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