Generalized concavity (e-book) 
Avriel, Mordecai ; Diewert, Walter E. ; Schaible, Siegfried ; Zang, Israel 
 -  SIAM  2010 
 - 348p 
 - Society for Industrial and Applied Mathematics .
<br/><br/> http://portal.igpublish.com/iglibrary/search/SIAMB0000410.main.html?31 
<br/><br/><label>ISBN: </label>9780898719437 
<br/><br/><label>Dewey Class. No.: </label>515.94  / (e-book)