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Hypoellipticité pour des classes d'opérateurs pseudodifferentiels à caractéristiques multiples
Bernard Helffer1976

Hypoelliptic Estimates and Spectral Theory for Fokker-Planck Operators and Witten Laplacians (Lecture Notes in Mathematics Book 1862)
Francis Nier2005

Quantitative Analysis of Metastability in Reversible Diffusion Processes Via a Witten Complex Approach
Bernard Helffer2006

Hypoelliptic estimates and spectral theory for Fokker-Planck operators and Witten Laplacians
Bernard Helffer2005