1. Complications of intrauterine device: Report of five cases of ectopic placement of the Bow;Nakamoto;Am J Obstet Gynec,1966
2. Complications of intrauterine devices;Buchman,1968
3. Unusual uterine perforation with a new intrauterine device;Lehfeldt;Obstet Gynec,1971
4. A survey of deaths and critical illness in association with the use of intrauterine devices;Scott;Internat J Fertil,1968