Naji, N. A. “Determination of Magnesium, Zinc, and Reduced Glutathione Levels in Serum of Asthmatic Patients”. Ibn AL-Haitham Journal For Pure and Applied Sciences, vol. 19, no. 1, Nov. 2017, pp. 114-2, https://jih.uobaghdad.edu.iq/index.php/j/article/view/1541.