Al-Sabha, Theiaa, Thabit S. Al-Ghabsha, and Maha Al-Obaidi. “Spectrophotometric Determination Of Nitrazepam And Dapson Using Vanillin Reagent in Pharmaceutical Preparations”. Journal of Education and Science (JES) 27, no. 1 (March 1, 2014): 43–57. Accessed August 6, 2025. https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23305.