Nath, Bipul, et al. “Design and Development of Metformin HCl Floating Microcapsules Using Two Polymers of Different Permeability Characteristics”. International Journal of Pharmaceutical Sciences and Nanotechnology(IJPSN), vol. 2, no. 3, Nov. 2009, pp. 627-3, doi:10.37285/ijpsn.2009.2.3.6.