Hameed, Maliha, et al. “DOSE COMPARISON AND SIDE EFFECT PROFILE OF METFORMIN EXTENDED RELEASE VERSUS METFORMIN IMMEDIATE RELEASE”. Journal of Ayub Medical College Abbottabad, vol. 29, no. 2, Apr. 2017, pp. 225-9, https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/2955.