Haji, Lailan M., Subhi R.M. Zeebaree, Karwan Jacksi, and Diyar Q. Zeebaree. 2018. “A State of Art Survey for OS Performance Improvement”. Science Journal of University of Zakho 6 (3):118-23. https://doi.org/10.25271/sjuoz.2018.6.3.516.