Gould, S.H <br/><br/>
Variational methods for eigenvalue problems  introduction to the methods of rayleigh, ritz, weinstein & aronszajn 
S.H. Gould 
 - New York  Dover Publications  1995 
 - xii  179 
<br/><br/><label>ISBN: </label>9780486687124 
<br/><br/><label>Dewey Class. No.: </label>4.13+11.14  / GOUL