Halmos, P.R. <br/><br/>
A hilbert space problem book / 
P.R. Halmos. 
 - 2nd rev. and enlarged ed. 
 - [S.l.] :  Springer,  1974 
 - 396 p. ;  24 cm. 
 - Graduate texts in mathematics. .
 - Graduate texts in mathematics. .
<br/><br/><label>ISBN: </label>0387906851 9780387906850 
<br/><br/><label>Dewey Class. No.: </label>515.733