Kato, Tosio. <br/><br/>
A short introduction to perturbatuion theory for linear operators / 
by Tosio Kato. 
 - New York, N.Y. :  Springer-Verlag,  1982. 
 - xiii, 161 p. 
<br/><br/><label>ISBN: </label>0387906665 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linear operators.<br/>Perturbation (Mathematics).