“Efficacy of The Ranitidine Bismuth Citrate And Chlaritromycin Combination For Ulcer Healing And Helicobacter Pylori Eradication ”. Annals of Medical Research, vol. 9, no. 3, May 2021, pp. 0169-73, http://www.annalsmedres.org/index.php/aomr/article/view/2923.