Helffer, Bernard. <br/><br/>
Hypoelliptic estimates and spectral theory for Fokker-Planck operators and Witten Laplacians / 
Bernard Helffer, Francis Nier . 
 - Berlin ;  New York :  Springer,  c2005. 
 - x, 209 p. :  ill. ; 
 - Lecture notes in mathematics,  1862  0075-8434 ; .
<br/><br/><label>ISBN: </label>3540242007 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hypoelliptic operators.<br/>Spectral theory (Mathematics)
<br/><br/><label>Universal Decimal Class. No.: </label>517.95  / HEL