Engelfriet, Joose. <br/><br/>
Simple program schemes and formal languages   
by Joose Engelfriet 
 - Berlin  Springer-Verlag  1974 
 - vi, 254p. 
 - Lecture Notes in Computer Science  V.20 .
<br/><br/><label>ISBN: </label>3540069534 
<br/><br/><label>Dewey Class. No.: </label>001.642  / N746