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“FORMULATION AND IN-VITRO EVALUATION OF GASTRO-RETENTIVE MICROSPHERE CONTAINING CALENDULA OFFICINALIS FOR THE TREATMENT OF PEPTIC ULCERS USING OKRA MUCILAGE AND ETHYL CELLULOSE”, Int. Res. J. Pharm., vol. 7, no. 11, pp. 38–42, Nov. 2016, Accessed: Aug. 24, 2026. [Online]. Available: https://irjponline.org/index.php/irjp/article/view/1545