ACOS-4/AVP  RIQS reference manual DFR21E - 5 

 -  Tokyo : NEC  1987 
 - 619 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Relational Information query system : RIQS
<br/><br/><label>Dewey Class. No.: </label>519.68/12  / NS