Halmos, Paul R. <br/><br/>
Hilbert space problem book 
byPaul R. Halmos 
 - New York  American Book  1967 
 - xvii,365p.;  24cm.- 
 - university series in higher mathematics; no.13 .
<br/><br/><label>Dewey Class. No.: </label>515.73  / HAL