On local and global analytic and Gevrey hypoellipticity
Journées équations aux dérivées partielles (1995), article no. 9, 7 p. 
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     title = {On local and global analytic and {Gevrey} hypoellipticity},
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     eid = {9},
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     publisher = {Ecole polytechnique},
     year = {1995},
     mrnumber = {96h:35029},
     zbl = {0881.35026},
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     url = {http://archive.numdam.org/item/JEDP_1995____A9_0/}
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Christ, Michael. On local and global analytic and Gevrey hypoellipticity. Journées équations aux dérivées partielles (1995), article  no. 9, 7 p. http://archive.numdam.org/item/JEDP_1995____A9_0/

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