1. Ectopic pregnancy;Rock,1994
2. Chronic ectopic pregnancy;Clark;J Natl Med Assoc,1975
3. Chronic ectopic pregnancy: a comparison with acute ectopic pregnancy;Bedi;Eur J Radiol,1987
4. Early extrauterine pregnancy;Henderson;Am J Obstet Gynecol,1950
5. Ectopic pregnancy — report of 132 cases and comments on the role of culdoscope in diagnosis;Riva;Obstet Gynecol,1962