Ali, Wisam, Amnah Kareem, and Manal Jasim. “Survey on Wireless Indoor Positioning Systems”. Cihan University-Erbil Scientific Journal 3, no. 2 (August 20, 2019): 42-47. Accessed October 1, 2022. https://journals.cihanuniversity.edu.iq/index.php/cuesj/article/view/111.