Voland, Eckart. <br/><br/>
Population Increase and Sex Biased Parental Investment in Humans :   evidence from I8th and 19th Century Germany. 

 - Chicago-US :   Department of Human Sciences,   1997. 
 - p. 129-135 :   il. 
 - Trimestral 
 - Vol.38, no. 1(Feb. 1997) 
 - Current Anthropolgy ;   vol. 38 no. 1 .
 - Estados Unidos.   The University of Chicago Press. .
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