1. Analysis of mortality data;Jorge;Rev. Saúde Pública,1997
2. Natural variation in the human sex ratio;Jacobsen;Hum. Reprod,1999
3. Factors affecting the sex ratio in humans: multivariate analysis of the Italian population;Ullizzi;Hum. Biol,1995
4. Demography of the human sex ratio in some Latin American countries, 1967–1986;Feitosa;Hum. Biol,1992
5. Determinants of the sex ratio at birth: review of recent literature;Chahnazarian;Soc. Biol,1988