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

 -  1969 
 - x,127p.  cm. 
<br/><br/><label>Standard No.: </label>125710 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B24 N, K9