Birman, M. S. and Solomjak, M. Z. <br/><br/>
Spectral theory of self-adjoint operators in hilbert space / 

 - Dordrecht:  D. Reidel,  1987 
 - xvi, 301p. Index. 
 - Mathematics and its applications (Soviet series) .
<br/><br/><label>ISBN: </label>9027721793 
<br/><br/><label>Dewey Class. No.: </label>515.72  / B619.ST