Suhad Abdel Moneim Yassin, and Khalaf F Al-Samarrai. “Ratio Spectrum Derivative Quantitative Analysis of Propranolol and Diazipam in Combind Pharmaceutical Mixtures”. International Journal of Research in Pharmaceutical Sciences, vol. 10, no. 4, Nov. 2019, pp. 3657-64, https://ijrps.com/home/article/view/3224.