“Anti-Gastric Ulcer Effect of Betulinic Acid in Male Albino Rats” (2021) Nigerian Journal of Physiological Sciences, 30(1), p. 033–037. Disponível em: https://www.ojshostng.com/index.php/njphysiologicalsciences/article/view/1831 (Acesso em: 21 maio 2026).