Darweesh, Samar A. “Simultaneous Determination of Sulfanilamide and Furosemide by Using Derivative Spectrophotometry”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 29, no. 2, Mar. 2017, pp. 240-53, https://jih.uobaghdad.edu.iq/index.php/j/article/view/113.