1. Diagnosis of ectopic pregnancy;Hibbard;Obstet Gynecol,1956
2. Ectopic pregnancy;Brenner;JAMA,1980
3. Contemporary management of ectopic pregnancy;DeCherney;J Reprod Med,1981
4. Culdocentesis and ectopic pregnancy;Cartwright;J Reprod Med,1984
5. Discriminatory hCG zone: its use in the sonographic evaluation for ectopic pregnancy;Kadar;Obstet Gynecol,1981