Abhijeet U. Bankar, Vidyadhar H. Bankar, Preeti D. Gaikwad, and Sunil P.Pawar. “Formulation Design and Optimization of Sustained Release Tablet of Ambroxol Hydrochloride”. International Journal of Drug Delivery, vol. 4, no. 3, Sept. 2012, pp. 375-8, https://ijdd.arjournals.org/index.php/ijdd/article/view/159.