M. Hamd, M., مرتضى, W. K. Hassan, and ولید. “OLAP Techniques for Approximation and Mining Query Answering”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 7, no. 3, June 2025, pp. 201-12, https://rjps.uomosul.edu.iq/index.php/csmj/article/view/20009.