Moiz Md, Prathima Srinivas M, and Sadanandam M. “Formulation and Evaluation of Bilayered Tablets of Montelukast and Levocetrizine Dihydrochloride Using Natural and Synthetic Polymers”. International Journal of Drug Delivery, vol. 3, no. 4, Dec. 2011, pp. 597-18, https://ijdd.arjournals.org/index.php/ijdd/article/view/109.