Halmos, P.R <br/><br/>
Hilbert space problem book 
P.R. Halmos 
 - New York  Springer  1974 
 - xvii  365 
 - Graduate texts in mathematics 19 .
<br/><br/><label>ISBN: </label>354090090x 
<br/><br/><label>Dewey Class. No.: </label>5.02  / HALM