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A novel validated UPLC method for quantitation of lopinavir and ritonavir in bulk drug and pharmaceutical formulation with its impurities . Braz. J. Pharm. Sci. [Internet]. 2014 Apr. 1 [cited 2024 May 20];50(2):301-8. Available from: https://www.revistas.usp.br/bjps/article/view/86937