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Pseudo-differential operators / H. G. Feichtinger, B. Helffer, L. Rodino [et al.], 2008 r=on-line. - Текст : электронный.
Helffer B. Hypoelliptic estimates and spectral theory for Fokker-Planck operators and witten laplacians / B. Helffer, F. Nier, 2005 r=on-line. - Текст : электронный.
Fournais S. Spectral methods in surface superconductivity / S. Fournais, B. Helffer, 2009 r=on-line. - Текст : электронный.