1. Sex selection;Shettles;Infertility,1978
2. Sex preselection—not yet practical;Priotrow,1975
3. Psychological perspectives: family planning in Korea;Chung;Population/Family Planning,1973
4. Sex preselection the United States: some implications;Westoff;Science,1974
5. Variation in the sex ratio at birth in the United States;Ciocco;Hum Biol,1938