1. Interstitial line: Sonographic Finding in Interstitial (Cornual) Ectopic Pregnancy;Ackerman;Radiology 189(1),1993
2. Akrivis Ch, Varras M, Kyparos J, Demou A, Stefanaki S, et al. (2003) Early Ultrasonographic Diagnosis of Unruptured Interstitial Pregnancy: A Case Report and Review of the Literature. Clin Exp Obstet Gynecol 30(1): 60-64.
3. Ectopic Pregnancy;Rizk;B Rizk (Ed ) Ultrasound in reproductive medicine and infertility Chapter 31 Cambridge University Press Cambridge USA,2010
4. Interstitial Pregnancy: Early Diagnosis by Ultrasonography;Auslender;Am J Obstet Gynecol 146(6),1983
5. Faraj R, Steel M (2007) Review Management of Cornual (Interstitial) Pregnancy. Obstet Gynaecol 9: 249-255.