Kato, Tosio <br/><br/>
A short introduction to perturbation theory for linear operators  / 

 - New York:  Springer-Verlag,  1982 
 - xiii, 161p. Index, Bibl. 
<br/><br/> "Slightly expanded version of chapters 1 & 2 of Tosio Kato 'Perturbation theory for linear operators, 2nd ed.'" 
<br/><br/><label>Dewey Class. No.: </label>515.72  / K19.SI