1. Keith, L., Bailey, R., Berger, G. and Method, M. (1984). Surface changes in IUDs after variable usage.Am. J. Obstet. Gynecol. (in press)
2. Keith, L., Bailey, R. and Berger, G. (1984). Morphologic changes on the surface of IUDs: are they of clinical significance? Presented at the International Symposium ‘Future Aspects in Contraception’. Ruprecht-Karls-Universität, Heidelberg, Germany. Sept. 9
3. GosdenC., RossA. and LoudonN. (1977). Intrauterine deposition of calcium on copper-bearing intrauterine contraceptive devices.Br. Med. J.,1, 202–206
4. RosenfeldJ., WilliamsW. and SharmaN. (1981). SEM analysis of copper-containing intrauterine implants.J. Biomed. Mat. Res.,15, 605–610