Rellich, Franz <br/><br/>
Perturbation theory of eigenvalue problems / 

 - New York:  Gordon & Breach Science Publishers Ltd.,  1969 
 - x, 127p. Index 
 - Notes on Mathematics and its applications .
<br/><br/><label>ISBN: </label>0677006853 
<br/><br/><label>Dewey Class. No.: </label>515.72  / R383.PT