Friedrichs, K. O. <br/><br/>
Spectral theory of operators in Hilbert space 
[by] K. O. Friedrichs. 
 - New York,  Springer-Verlag,  1973. 
 - viii, 244 p. 
 - Applied mathematical sciences,  v. 9 .
<br/><br/><label>ISBN: </label>0837900764 
<br/><br/><label>Subjects--Index Terms: </label>Spectral theory 
<br/><br/><label>Universal Decimal Class. No.: </label>517.956.227  / FRI