1. Dapunt O., Waclawiczek H.W., Pimpl, W., Kaindl N.: Acta Chir. Austriaca 18 (1986), Heft 3: 172
2. Polterauer P., Wayand W.: Acta Chir. Austriaca 5 (1973): 16–18
3. Pratt S.M., Weaver F.A., Potts III J.R.: Surgery, Gynecology & Obstetrics 165 (1987): 53–56