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

 - New York  Dover Publications  1995 
 - xii, 179p 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0-486-68712-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus of variations<br/>Differential equations<br/>Mathematics<br/>Vibration