K. S. Natraj, “Analytical Method Development and Validation for the Estimation of Related Substances in Oxybutynin HCl Prolonged Release Tablets by Reverse-Phase High- Performance Liquid Chromatographic: Analytical Method Development and Validation for the Estimation of Related Substances in Oxybutynin HCl Prolonged Release Tablets by Reverse-Phase High- Performance Liquid Chromatographic”, ijpba, vol. 9, no. 03, Oct. 2018.