"Anti-Gastric Ulcer Effect of Betulinic Acid in Male Albino Rats" (2021) Nigerian Journal of Physiological Sciences, 30(1), ص 033–037. موجود في: https://www.ojshostng.com/index.php/njphysiologicalsciences/article/view/1831 (تاريخ الوصول: 8 يوليو 2026).