Fayaz, M. W., P. Chasta, T. H. Sheikh, M. A. Rather, A. H. Kumar, and A. Mustafa. “Gastroretentive Drug Delivery System”. Journal of Drug Discovery and Development ( ISSN:2581-6861), vol. 2, no. 1, Oct. 2018, pp. 11-17, http://www.medicaljournalshouse.com/index.php/JDrug-Discovery-Development/article/view/59.