Friedrichs, Kurt Otto <br/><br/>
Spectral theory of operators in Hilbert space / 
K.O. Friedrichs 
 - New York :  Springer-Verlag,  1973 
 - 244 p. ;  26 cm. 
 - Applied mathematical sciences  v.9 .
<br/><br/>Bibliography : p. 241 
<br/><br/><label>ISBN: </label>0387900764 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hilbert space<br/>Spectral theory (Mathematics)<br/>Operator theory