Gould, S.H. <br/><br/>
Variational methods for eigenvalue problems  an introduction to the methods of rayleigh,ritz,.... 

 - New York  Dover Publications,Inc.  1995 
 - xii,179p.  23cm.PB 
<br/><br/><label>ISBN: </label>0486687120 
<br/><br/><label>Dewey Class. No.: </label>515.64  / GOU