M. ÇETİN, Ömer ÖZBAKIR, O. Kontaş, H. TAŞKAPAN, and M. YÜCESOY, “Protective effects of vitamin E and Gingko biloba extract on stress induced gastric mucosal injury in rats”, Turkish Journal of Gastroenterology, vol. 12, no. 1, pp. 23–26, Jan. 2001.