Zachmann, Rainer <br/><br/>
Visual presentation of research results 
/ Rainer Zachmann, Carmen Siri 
. - Ibadan  : IITA, 1995
. - 29p.  : Couv. ill.  ; 22Cm. 
 - IITA Research guide  45 .
<br/><br/><label>Universal Decimal Class. No.: </label>630.