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MR897103 (88i:35029) 35H05 (22E25 32F20 58G05)
Helffer, Bernard; Nourrigat, Jean Hypoellipticité maximale pour des opérateurs polynômes de champs de vecteurs. (French) [Maximal hypoellipticity for polynomial operators of vector fields] Progress in Mathematics, 58. Birkhäuser Boston, Inc., Boston, MA, 1985. x+278 pp. ISBN: 0-8176-3310-3
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