1. Tubal twins and tubal pregnancy;Arey;Surg., Gynec. & Obst.,1923
2. Simultaneous bilateral tubal pregnancy; case;Torpin;Am. J. Obst. & Gynec.,1940
3. Bilateral simultaneous tubal pregnancy;Fishback;Am. J. Obst. & Gynec.,1939
4. Bilateral tubal pregnancy; case;Grim;Pennsylvania M. J.,1939
5. Simultaneous bilateral tubal pregnancy; case;Froewis;Zentralbl. Gynäk.,1939