Azeez, Ali Abid Hussan, and Rehab Flaih Hassan. “Using Space-Filling Curves to Improve the Quad Tree for Spatial Indexing”. Journal of Al-Qadisiyah for Computer Science and Mathematics 11, no. 3 (September 10, 2019): Comp Page 94–104. Accessed November 14, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/610.