Gould S.H. <br/><br/>
Variational methods for eigenvalue problems. An introduction to the methods of Rayleigh, Ritz, Weinstein and Aronszajn. 
Gould S.H. 
 - Toronto  University Press  1957 
 - 191 p. 
<br/><br/> Mathematical Expositions N 10 
<br/><br/><label>Dewey Class. No.: </label>517.983