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Burrell, R. J. W., Healy, M. J. R. and Tanner, J. M. 1961. Age at menarche in South African Bantu schoolgirls living in the Transkei Reserve. Human Biology. 33 (3), pp. 250-261.
Simpson, H. R. 1958. The effect of sterilised males on a natural tsetse fly population. Human Biology. 14 (2), pp. 159-173. https://doi.org/10.2307/2527782