1. Unilateral twin tubal pregnancy;BoRRow, M.L.; SCHREIBER, I.;Amer. J. Obstet. Gynec,1961
2. Unilateral tubal twin pregnancy;BUCKLIN, R.; MYINT, M.K.;Amer. J. Obstet. Gynec,1959
3. Unilateral tubal twin pregnancy;DEMICK, P.E.; CAVANAGH, D.;Amer. J. Obstet. Gynec,1958
4. Bilateral ectopic gestation;EVANS, G.E.; GOYANES, E.;Amer. J. Obstet. Gynec,1952
5. Interstitial twin pregnancy with cornual rupture;FARA, F.J.; VARGA, A.;Obstet. and Gynec,1957