Tosio Kato <br/><br/>
Short introduction to perturbatton theory for linear operations 

 - London  Springer Verlag  1982 
 - xiii,161 p.  24 cm 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Mathemetics:LinearOperations
<br/><br/><label>Dewey Class. No.: </label>512.5  / LAT