FORMULATION AND IN-VITRO EVALUATION OF GASTRO-RETENTIVE MICROSPHERE CONTAINING CALENDULA OFFICINALIS FOR THE TREATMENT OF PEPTIC ULCERS USING OKRA MUCILAGE AND ETHYL CELLULOSE. International Research Journal of Pharmacy, [S. l.], v. 7, n. 11, p. 38–42, 2016. Disponível em: https://irjponline.org/index.php/irjp/article/view/1545. Acesso em: 25 aug. 2026.