1. Suppression of fertility by intrauterine copper and zinc in rabbits: a new approach to intrauterine contraception;Zipper;Am J Obstet Gynecol,1969
2. Copper intrauterine devices: Evaluation for longterm use (review);Newton;Br J Obst Gynaecol,1982
3. Milestones in intrauterine device development;Tatum;Fertility and Sterility,1983
4. Uterine geometry and IUCD design;Hasson;Br J Obst Gynaecol,1982