SHAGALAMARRI KIRAN KUMAR, et al. “FORMULATION DEVELOPMENT, IN-VITRO AND IN-VIVO EVALUATION OF TAPENTADOL HCL CONTROLLED RELEASE MATRIX TABLETS USING HYDROPHOBIC POLYMERS”. International Journal of Pharma and Bio Sciences, vol. 4, no. 4, Dec. 2013, pp. 682-91, https://ijpbs.net/index.php/journal/article/view/2800.