Baumgartel, H. <br/><br/>
Analytic perturbation theory for matrices and operators  / 

 - Basel:  Birkhauser Verlag,  1984 
 - 427p. Index, Bibl. 
 - Operator theory advances and applications ;   v.15 .
<br/><br/><label>Dewey Class. No.: </label>515.72  / B348.AP