S.Shamma parvin, C.Haranath, C.Surya Prakash Reddy, and Dr. C. Sowmya. “AN OVERVIEW ON SR TABLET AND IT’ S TECHNOLOGY”. International Journal of Pharmaceutics and Drug Analysis, vol. 2, no. 9, Sept. 2014, pp. 740-7, https://ijpda.org/index.php/journal/article/view/101.