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E. Kathleen Gough, Changing Kinship Usages in the Setting of Political and Economic Change Among the Nayars of Malabar, The Journal of the Royal Anthropological Institute of Great Britain and Ireland, Vol. 82, No. 1 (Jan. - Jun., 1952), pp. 71-88
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E. Kathleen Gough (1952) studied this question.
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