Levialdis <br/><br/>
1989 IEEE workshop on visual languages 

 - 
 -  VL Foundation: California  1989 
 - 193 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-8186-2002-1 
<br/><br/><label>Dewey Class. No.: </label>004.236