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Bittles, AH and Devi, Radha Rama A and Rao, Appaji N (1988) Consanguinity, twinning and secondary sex ratio in the population of Karnataka, South India. In: Annals of Human Biology, 15 (6). pp. 455-460.
Dev, Radha Rama A and Rao, Appaji N and Bittles, AH (1981) Consanguinity, fecundity and post-natal mortality in Karnataka, South India. In: Annals of Human Biology, 8 (5). 469 -472.