Rao P Y G, Sreenivasa Rao B, Suresh Reddy K V N and Sudhakar CH 2020. A Selective and Sensitive Method for Simultaneous Quantification of Genotoxic Impurities in Penciclovir drug substance and its dosage forms using UPLC-MS/MS. International Journal of Research in Pharmaceutical Sciences. 11, 4 (Oct. 2020), 5772–5776.