Hassib, S. T., A. E. Farag, M. A. Mahrouse, and E. A. Mostafa, "Validated Derivative Spectrophotometric and Chromatographic Methods for the Determination of Doxazosin Mesylate in Presence of its Degradation Product and/or Related Impurity", International Journal of Pharmaceutical Analysis, vol. 38, issue 2, pp. 1146-1155, 2013.
Hassib, S. T., A. E. Farag, M. A. Mahrouse, and E. A. Mostafa, "Spectrophotometric Determination of Oxybutynin Hydrochloride via Charge - Transfer Complexation Reaction", International Journal of Pharmaceutical and Chemical Sciences, vol. 2, issue 4, pp. 2024-2033, 2013. 60-728.pdf