Helffer, B & Nier, F <br/><br/>
Hypoelliptic estimates & spectral theory for fokker-planck operators & witten laplacians 
B. Helffer & F. Nier 
 - Berlin  Springer  2005 
 - x  209 
 - Lecture notes in mathematics 1862 .
<br/><br/><label>ISBN: </label>9783540242000 
<br/><br/><label>Dewey Class. No.: </label>5.03+10.07+10.04+13.04  / HELF