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	1.	Semi-classical analysis for the Schrodinger operator and applications / Bernard Helffer. by Helffer, Bernard Series: Lectures notes in mathematics ; 1336. Publication details: Berlin: Springer-Verlag, 1988 Availability: Items available for loan: PERPUSTAKAAN TUN SERI LANANG (1)Call number: QA329.H44. Place hold
	2.	Hypoelliptic Estimates and Spectral Theory for Fokker-Planck Operators and Witten Laplacians [electronic resource] / by Bernard Helffer, Francis Nier. by Helffer, Bernard Nier, Francis SpringerLink (Online service) Series: Lecture Notes in Mathematics ; 1862 Publication details: Berlin Heidelberg : Springer-Verlag GmbH., 2005 In: Springer e-books Online resources: Click here to access online Availability: No items available.

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