APA-referens

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

Chicago-stil citat

Helffer, Bernard, och Francis Nier. Hypoelliptic Estimates and Spectral Theory for Fokker-Planck Operators and Witten Laplacians. Berlin ; New York: Springer, 2005.

MLA-referens

Helffer, Bernard, och Francis Nier. Hypoelliptic Estimates and Spectral Theory for Fokker-Planck Operators and Witten Laplacians. Springer, 2005.