Zeidler, Eberhard. <br/><br/>
Nonlinear functional analysis and its applications - V.3  variational methods and optimization 
by Eberhard Zeidler, tr. by Leo F. Boron 
 - New York  Sprigner-Verlag  1985 
 - xxii, 662p. 
<br/><br/><label>ISBN: </label>038790915X 
<br/><br/><label>Dewey Class. No.: </label>515.7  / N86.3