S. Rajeswari, S. Kudamala, and K. V. R. Murthy, “DEVELOPMENT, FORMULATION AND EVALUATION OF A BILAYER GASTRIC RETENTIVE FLOATING TABLETS OF RANITIDINE HCL AND CLARITHROMYCIN USING NATURAL POLYMERS”, Int J Pharm Pharm Sci, vol. 9, no. 9, pp. 164–177, Sep. 2017.