Assi, Saeed H., and Ryaidh Sh. Al_Husain. “Study of Protective Effect of Glutathione Peroxidase (GSH-Px), Vitamin E and Selenium on Iraqi Children With Leukemia”. Journal of Biotechnology Research Center, vol. 8, no. 4, Dec. 2014, pp. 15-21, doi:10.24126/jobrc.2014.8.4.371.