1. Copper-bearing intrauterine devices;Tatum;Clin. Obstet. Gynecol.,1979
2. Hysteroscopic removal of copper-containing intraulterine devices with missing tails during pregnancy;Assaf;Adv. Contracept.,1988
3. Hysteroscopic removal of missed IUD during early pregnancy;Helem;Am. J. Obstet. Gynecol.,1984
4. Ultrasonic localisation of the IUD;Nemes;Am. J. Obstet. Gynecol.,1971
5. Moglichkeiten der extraktion von intrauterin pessaren bei eingetretener Schwangerschaft;Wagner;Med. Welt.,1980