1. Adel SK, Ghoneim MA, Sobrero AJ: Hysterography study of long-term effects of intrauterine contraceptive devices. Fertil Steril 22: 651, 1971.
2. Advisory Committee on Obstetrics and Gynecology: Report on intrauterine contraceptive devices, Washington DC, Food and Drug Administration, 1968.
3. Behrman SJ, Burchfield W: The intrauterine contraceptive device and myometrial activity. Am J Obstet Gynecol 100: 194, 1968.
4. Behrman SJ, Archie JT, O’Brien OP: Myometrial activity and the IUCD II: propagation waves. Am J Obstet Gynecol 104: 123, 1969.
5. Bernstine RL, Davidson AR, Duncan GW, et al.: Review and analysis of the scientific and clinical data on the safety, efficacy, adverse reactions, biological action, utilization, and design of intrauterine devices, Springfield, Va, US Department of Commerce, National Technical Information Service, PB-249-614, 1975.