1. Role of endovaginal sonography in the diagnosis and management of ectopic pregnancy;Atri;Radiographics,1996
2. The first trimester and ectopic pregnancy;Middleton,2003
3. O'Boyle M. Ectopic pregnancy: an update. Presented at the 29th Annual Spring Diagnostic Ultrasound Conference, Los Angeles. April 23–25, 2004. p. 61–8.
4. Heterotopic pregnancy;Doubilet,2003
5. Fetal measurements: normal and abnormal fetal growth;Benson,1998