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MR661164 (84c:35026) 35H05 (22E30 58G05)
Helffer, Bernard Conditions nécessaires d'hypoanalyticité pour des opérateurs invariants à gauche homogènes sur un groupe nilpotent gradué. (French) [Necessary conditions of hypoanalyticity for homogeneous left-invariant operators on a graded nilpotent group] J. Differential Equations 44 (1982), no. 3, 460–481.
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