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MR364843 (51 #1097) 35H05
Helffer, Bernard Sur l'hypoellipticité d'une classe d'opérateurs paraboliques dégénérés. (French) Sur quelques équations aux dérivées partielles singulières, pp. 79–105, 123. Asterisque, No. 19, Soc. Math. France, Paris, 1974.
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