M. Hamd, Murtadaha, and Waleed K. Hassan. “OLAP Techniques for Approximation and Mining Query Answering”. AL-Rafidain Journal of Computer Sciences and Mathematics 7, no. 3 (December 10, 2010): 201–212. Accessed September 26, 2025. https://csmj.uomosul.edu.iq/index.php/csmj/article/view/37046.