Kaur, Kirandeep, et al. “Comparison of Efficacy of Add-on Therapy of Vildagliptin Versus Pioglitazone Among Type 2 Diabetes Mellitus Patients Inadequately Controlled on Dual Therapy of Metformin Plus Sulfonylurea”. Asian Journal of Medical Sciences, vol. 5, no. 3, Feb. 2014, pp. 77-81, https://nepjol.info/index.php/AJMS/article/view/9482.