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Some Non-Analytic-Hypoelliptic Sums of Squares of Vector Fields
Author(s):
Michael
Christ
Journal:
Bull. Amer. Math. Soc.
26
(1992),
137-140.
MSC (1991):
Primary 35A20, 35B65, 35H05
MathSciNet review:
1110438
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References:
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Additional Information:
DOI:
10.1090/S0273-0979-1992-00258-6
PII:
S 0273-0979(1992)00258-6
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