Gopfert, A., et al <br/><br/>
Variational methods in partially ordered spaces 
A. Gopfert, et al 
 - New York  Springer  2003 
 - xi  351 
 - CMS books in mathematics .
<br/><br/><label>ISBN: </label>9780387004525 
<br/><br/><label>Dewey Class. No.: </label>5.02+4.13+15.01+5.07+5.08  / GOPF