Ekeland, Ivar and T़mam, Roger <br/><br/>
Convex analysis and variational problems (e-book) 

 -  Siam  1999 
 - 417p 
 - Classics in Applied Mathematics .
<br/><br/> http://portal.igpublish.com/iglibrary/search/SIAMB0000124.main.html?58 
<br/><br/><label>ISBN: </label>9780898714500 
<br/><br/><label>Subjects--Index Terms: </label>Mathematical optimization; Convex functions; Calculus of variations 
<br/><br/><label>Dewey Class. No.: </label>515.64  / (e-book)