Chavada, Vijay D., et al. “COMPARATIVE EVALUATION OF FIRST ORDER, ABSORBANCE RATIO AND BIVARIATE SPECTROPHOTOMETRIC METHODS FOR DETERMINATION OF ATOVAQUONE AND PROGUANIL IN PHARMACEUTICAL FORMULATION MALARONE®”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 7, no. 9, Sept. 2015, pp. 165-71, https://www.journals.innovareacademics.in/index.php/ijpps/article/view/7296.