U. Satyanarayana, P. R. . Reddy, K. K. . Reddy, and K. R. . Krishna, “A Simple, Sensitive, Specific Reversed-Phase Ultra Performance Liquid Chromatographic UV Method For Estimation Of Paratoluenesulfonic Acid In Valacyclovir Hydrochloride Sample”, Carib. J. Sci. Tech., vol. 2, no. 01, pp. 642–648, Jan. 2014.