B, V., H. B. K, R. A, and V. G. “Development Method Validation of RP-HPLC Method for Simultaneous Determination of Lopinavir and Ritonavir in Bulk and Formulation Dosage ”. International Research Journal of Pharmaceutical and Applied Sciences, Vol. 2, no. 4, Aug. 2012, pp. 84-90, https://scienztech.org/index.php/irjpas/article/view/355.