“FORMULATION AND IN-VITRO EVALUATION OF GASTRO-RETENTIVE MICROSPHERE CONTAINING CALENDULA OFFICINALIS FOR THE TREATMENT OF PEPTIC ULCERS USING OKRA MUCILAGE AND ETHYL CELLULOSE” (2016) International Research Journal of Pharmacy, 7(11), pp. 38–42. Available at: https://irjponline.org/index.php/irjp/article/view/1545 (Accessed: 7 July 2026).