Southwell, Beth. <br/><br/>
A preliminary report on the development of the operator construct of rational number in Papua New Guinea / 
Beth Southwell. 
 -  [1980]. 
 - p. 187-199. 
<br/><br/> Photocopy from : Papers presented to the 4th Annual Conference of the Mathematics Education Research Group of Australia, 1980. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching--Papua New Guinea.<br/>Mathematical ability--Testing.<br/>Numbers, Rational.