Dowson, H.R <br/><br/>
Spectral theory of linear operators 
H.R. Dowson 
 - London  Academic Press  1978 
 - xii  422 
 - London mathematical society monographs 12 .
<br/><br/><label>ISBN: </label>0122209508 
<br/><br/><label>Dewey Class. No.: </label>5.03  / DOWS