Kreyszig, Erwin. <br/><br/>
Introductory Functional Analysis with Applications 

 - New York  John Wiley and Sons  1978 
 - p.688 
<br/><br/><label>ISBN: </label>047103729X 
<br/><br/><label>Subjects--Topical Terms: </label> Metric  Spaces  Linear  Spectral 
<br/><br/><label>Dewey Class. No.: </label>517.5 K96I