A. H. Bittles, A. Radha Rama Devi, H. S. Savithri, Rajeswari Sridhar, N. Appaji Rao, Consanguineous Marriage and Postnatal Mortality in Karnataka, South India, Man, New Series, Vol. 22, No. 4 (Dec., 1987), pp. 736-745
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Bittles et al. (1987) studied this question.
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