Eerkens, Jelmer W. <br/><br/>
Practice makes within 5 :   visual perception, motor Skills, and Memory in Artifact variation. 

 - Chicago-US :   Department of Human Sciences,   2000. 
 - p. 663-668 
 - Trimestral 
 - Vol.41, no.4 (Aug-Oct. 2000) 
 - Current Anthropolgy, Suplement ;   vol. 41 no. 4 .
 - Estados Unidos.   The University of Chicago Press. .
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