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1995 Failure of analytic hypoellipticity for some operators of $X^2 + Y^2$ type
Toshihiko Hoshiro
J. Math. Kyoto Univ. 35(4): 569-581 (1995). DOI: 10.1215/kjm/1250518648
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Vol.35 • No. 4 • 1995
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