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	1.	Hypoelliptic estimates and spectral theory for Fokker-Planck operators and Witten Laplacians Bernard Helffer, Francis Nier by Helffer, Bernard Nier, Francis Series: Lecture notes in mathematics (Springer-Verlag) Publication details: Berlin New York Springer c2005 Online resources: Click here to access online Publisher description Table of contents only Availability: Items available for loan: IMAR (1)Call number: II 35792. Place hold Add to cart (remove)
	2.	Hypoellipticité maximale pour des opérateurs polynomes de champs de vecteurs Bernard Helffer, Jean Nourrigat by Helffer, Bernard Nourrigat, Jean Series: Progress in mathematics (Boston, Mass.) Publication details: Boston Birkhèauser 1985 Availability: Items available for loan: IMAR (1)Call number: II 27012. Place hold Add to cart (remove)
	3.	Semi-classical analysis for the Schrodinger operator and applications Bernard Helffer by Helffer, Bernard Series: Lecture notes in mathematics ; 1336 \| Lecture notes in mathematics (Springer-Verlag) Publication details: Berlin New York Springer-Verlag c1988 Availability: Items available for loan: IMAR (1)Call number: XXX-HEL-22. Place hold Add to cart (remove)

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