Patra , Ch Niranajan, et al. “Floating Microspheres: Recent Trends in the Development of Gastroretentive Floating Drug Delivery System”. International Journal of Pharmaceutical Sciences and Nanotechnology(IJPSN), vol. 4, no. 1, May 2011, pp. 1296-0, doi:10.37285/ijpsn.2011.4.1.2.