Kato Tosio <br/><br/>
Perturbation theory for linear operators. 

 - 2 
 -  1976 
<br/><br/><label>Standard No.: </label>12505 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B2893, L6