Suha Sabri Al Samarrai, Khalaf F. Alsamarrai, and Eman Thiab Alsamarrai. “Derivative Spectrophotometric for Simultaneous Estimation of Propranolol Hydrochloride and Hydrochlorothiazide in Synthetic Mixture”. International Journal of Research in Pharmaceutical Sciences, vol. 11, no. 1, Feb. 2020, pp. 967-73, https://ijrps.com/home/article/view/694.