Balazar, Jose Luis. <br/><br/>
Structural complexity II   
by Jose Luis Balcazar, Joseph Diaz, Joaquin Gabarro. 
 - Berlin  S-V  1990 
 - ix, 283p 
 - EATCS Monographs on theoretical computer science  Vol. 22 .
<br/><br/><label>ISBN: </label>0387520791 
<br/><br/><label>Dewey Class. No.: </label>005.1015113  / N90.2