M. GÜRSOY, G. GÜR, Y. ÜSTÜNDAĞ, B. DEMİRHAN, Çağlar BAYSAL, and S. BOYACIOĞLU, “Primary gastric choriocarcinoma: A case report and review of the literature”, Turkish Journal of Gastroenterology, vol. 11, no. 1, pp. 34–38, Jan. 2000.