«Anti-Gastric Ulcer Effect of Betulinic Acid in Male Albino Rats» (2021) Nigerian Journal of Physiological Sciences, 30(1), pp. 033–037. Disponible en: https://ojshostng.com/index.php/njphysiologicalsciences/article/view/1831 (Accedido: 5 junio 2026).