1. Fertility, family planning, and women’s health: new data from the 1995 National Survey of Family Growth. National Center for Health Statistics;Abma;Vital Health Stat 23,1997
2. Dose- and age-dependent ectopic pregnancy risks with intrauterine contraception;Sivin;Obstet Gynecol,1991
3. Mechanisms of action of intrauterine devices;Ortiz;Obstet Gynecol Surv,1996
4. Intrauterine contraception with the copper-T device: effect on trace elements in the endometrium, cervical mucus and plasma;Hagenfeldt;Contraception,1972
5. Inhibition of sperm motility in vitro by copper wire;Ullmann;Contraception,1972