1. Froriep , R. Chirurgische Kupfertafeln, Weimar 1824
2. Hydronephrose und Genitalprolaps;Stoeckli;Gynaecologia,1959
3. Hydroureter and hydronephrosis; a frequent secondary finding in cases of prolapse of the uterus and bladder;Brettauer;Am. J. Obst. & Gynec.,1923
4. The relationship between prolapse of the uterus and changes in the urinary tract;Danforth;Surg. Clin. N. America,1938