S. Anepu, L. Duppala, and S. S. M, “FORMULATION DEVELOPMENT, CHARACTERIZATION AND IN- VITRO EVALUATION OF FLOATING MATRIX DOSAGE FORM OF TRAMADOL HYDROCHLORIDE USING VARIOUS POLYMERS”, Asian J Pharm Clin Res, vol. 10, no. 2, pp. 281–290, Feb. 2017.