Rockafeller, R. Tyrrell <br/><br/>
The theory of subgradients and its applications to problems of optimization, convex and non-convex functions  / 

 - Berlin:  Haldermann-Verlag,  1981 
 - vii, 107p. 
 - Research and education in Mathematics   v. 1 .
<br/><br/><label>Dewey Class. No.: </label>519.91  / R682.TS