Sankar, D.G., K. Vijayasri, B. Snehalatha, T.K. Murthy, J.M.R. Kumar, and M.V.V.N. Reddy. 2010. “Spectrophotometric Estimation of Venlafaxine Hydrochloride and Ritodrine Hydrochloride ”. Asian Journal of Chemistry 14 (3):1779-81. https://asianpubs.org/index.php/ajchem/article/view/22492.