Memoires de la Societe mathematique de France.N.S. / Soc. math. de France. 105 : Quantitative analysis of metastability in reversible diffusion processes via a witten complex approach: the case with boundary / B.Helffer, F.Nier, 2006. - 89 p. - Текст : непосредственный.
Helffer B. Hypoelliptic estimates and spectral theory for Fokker-Planck operators and witten laplacians / B. Helffer, F. Nier, 2005 r=on-line. - Текст : электронный.