Bélanger Danièle, Khuat T. H. O., Liu J., Le Thanh Thuy, Pham Viet Thanh. Are Sex Ratios at Birth Increasing in Vietnam?. In: Population (English edition), 58ᵉ année, n°2, 2003. pp. 231-250.
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Bélanger et al. (2003) studied this question.
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