Phelps, Robert R. <br/><br/>
Convex functions, monotone operators and differentiability   

 - 2nd 
 - Berlin  Springer-Verlag  1993 
 - ix, 116p. Index. 
 - Lecture notes in Mathematics   1364 .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>515.7  / P541.CF