Παραπομπή APA

Helffer, B., & Nier, F. (2005). Hypoelliptic estimates and spectral theory for Fokker-Plank operators and witten Laplacians. Springer-Verlag.

Παραπομπή Chicago Style

Helffer, Bernard, και Francis Nier. Hypoelliptic Estimates and Spectral Theory for Fokker-Plank Operators and Witten Laplacians. Germany: Springer-Verlag, 2005.

Παραπομπή MLA

Helffer, Bernard, και Francis Nier. Hypoelliptic Estimates and Spectral Theory for Fokker-Plank Operators and Witten Laplacians. Springer-Verlag, 2005.