Zeidler, E. <br/><br/>
Nonlinear functional analysis and its applications :  part 3 :  variational methods and optimization / 
E. Zeidler, L.F. Boron. 
 - 1st ed. 
 - [S.l.] :  Springer,  1984. 
 - 688 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>038790915X 9780387909158 
<br/><br/><label>Dewey Class. No.: </label>515.7