Abdessadek, Mohammed, et al. “SIMPLE HPLC-UV METHOD FOR DETERMINATION OF METFORMIN IN HUMAN PLASMA AND ERYTHROCYTES APPLICATION TO THERAPEUTIC DRUG MONITORING”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 7, no. 11, Nov. 2015, pp. 35-39, https://www.journals.innovareacademics.in/index.php/ijpps/article/view/6086.