“Using of Third and Fourth Order Derivative Spectra to Simultaneous Determination of Olanzapine and Ephedrine in Its Pure and Pharmaceutical Formulations”. Ibn AL-Haitham Journal For Pure and Applied Sciences 30, no. 1 (June 11, 2017): 366–375. Accessed May 5, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/1085.