References
- Key TC, Kreutner AK. Gastro-intestinal complications of modern intrauterine devices. Obstet Gynecol. 1980; 55: 239–44.
- Rizk M, Shaban N, Medhat I, Moby el Dien Y, Ollo MA. Electron microscopic and chemical study of the deposits formed on copper and inert IUCD. Contraception. 1990; 42: 643–53.
- Yuan W, Shen H, Lu J, Fan J. Analysis of surface deposits on intrauterine contraceptive devices. Adv Contracept. 1986; 2: 193–204.