1. The loop after 10years;Lippes,1975
2. Evaluation of intrauterine devices. Ninth progress report of the CSP;Tietze;Stud Fam Plann,1970
3. An evaluation of the use-effectiveness of the Saf-T-Coil in private practice;Laufe;Contraception,1974
4. Comparison of the Antigon F, the Copper T and the Ypsilon IUDs;Fuchs,1975
5. Randomized comparative trial of three IUDs in rural Thailand: preliminary report of first 12-month follow-up;Somboonsuk,1975