”Anti-Gastric Ulcer Effect of Betulinic Acid in Male Albino Rats” (2021) Nigerian Journal of Physiological Sciences, 30(1), s. 033–037. Tillgänglig vid: https://www.ojshostng.com/index.php/njphysiologicalsciences/article/view/1831 (åtkomstdatum: 21 maj 2026).