B. Poornima, P. Jayachandra Reddy, and D.S.S.N. Neelima. “Method Development and Validation for the Simultaneous Determination of Ritonavir and Lopinavir by RP-HPLC and by UV- Spectrophotometry”. IJPAR JOURNAL, vol. 8, no. 2, Sept. 2022, pp. 227-40, doi:10.61096/ijpar.v8.iss2.2019.227-240.