Erdelyi, Ivan and Shongwang, Wang <br/><br/>
A local spectral theory for closed operators   

 - Cambridge  Cambridge University Press  1985 
 - 177p. Index. 
 - London Mathematical Society lecture note series no. 105 .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>515.72  / Er66.LS