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MR600685 (83f:35038) 35H05 (22E25 58G05)
Helffer, B. Hypoellipticité analytique sur des groupes nilpotents de rang $2$ (d'après G. Métivier). (French) [Analytic hypoellipticity on nilpotent groups of rank $2$ (following G. Métivier)] Séminaire Goulaouic-Schwartz, 1979–1980 (French), Exp. No. 1, 14 pp., École Polytech., Palaiseau, 1980.
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