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Heape, W., 1908. The proportion of the Sexes produced by Whites and Coloured Peoples in Cuba. Phil. Trans. Royal Soc. 200 B.
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Bonnier, G. On alleged seasonal variations of the sex-ratio in Man. Z.Ver-erbungslehre 32, 97–107 (1924). https://doi.org/10.1007/BF01816752
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DOI: https://doi.org/10.1007/BF01816752