0.20 Jean-Claude Muller, On Preferential/Prescriptive Marriage and the Function of Kinship Systems: The Rukuba Case (Benue-Plateau State Nigeria), American Anthropologist, 1973.

{ family marriage children women }	0.40
{ kinship terms descent term }	0.20
{ social analysis terms cultural }	0.09
{ social group groups political }	0.08