《Anti-Gastric Ulcer Effect of Betulinic Acid in Male Albino Rats》 (2021) Nigerian Journal of Physiological Sciences, 30(1), 页 033–037. 载于: https://www.ojshostng.com/index.php/njphysiologicalsciences/article/view/1831 (见于: 6 四月 2026).