1. Change in male-female ratio among newborn infants in Denmark;Moller, H.;Lancet,1996
2. Change in male-female ratio among newborn infants in Netherlands;der Pal-de Bruin KM, Van; SP, Verloove-Vanhorick; N, Roeleveld;Lancet,1997
3. Declining sex ratios in Canada;Allan, B.B.; Brant, R.; Seidel, J.E.;Can Med Assoc J,1997
4. Reduced ratio of male to female births in several industrial countries-a sentinel health indicator?;Davis, D.L.; Gottlieb, M.B.; Stampnitzky, JR;JAMA,1998
5. Statistical methods for rates and proportions;Fleiss, J.L.,1981