1. Intrauterine devices and their mechanisms of action;Segal,1971
2. Clinical aspect of intrauterine contraception;Tatum;Fertil. Steril.,1977
3. Intrauterine devices: biological actions;Moyer,1973
4. Intrauterine devices: current perspectives;Porter;Pathfinder Fund,1978
5. F.D.A.Medical Device and Drug Advisory Committee on Obstetrics Gynaecology;U.S.Department of Health, Education and Welfare,1978