Halmos, Paul R. <br/><br/>
Introduction to Hilbert space and the theory of spectral multiplicity   

 - 2nd 
 - New York  Chelsea  1957 
 - 114p. Bibl. 
<br/><br/> "Bibliography of Chelsea scientific Books".   
<br/><br/><label>Dewey Class. No.: </label>515.7  / H194.IH