1. BenMessaoud, R., Boussaid, O., Rabaseda, S.: A new OLAP aggregation based on the AHC technique. In: ACM 7th International Workshop on Data Warehousing and OLAP (DOLAP 04), pp.~65–72. Washington DC, USA (2004)
2. Boussaid, O., Bentayeb, F., Darmont, J.: A multi-agent system-based ETL approach for complex data. In: 10th ISPE International Conference on Concurrent Engineering: Research and Applications (CE 03), pp.~49–52. Madeira Island, Portugal. (2003)
3. Calvanese, D., Giacomo, G.D., Lenzerini, M., Nardi, D., Rosati, R.: Description logics framework for information integration. Sixth International Conference on Principles of Knowledge Representation and Reasoning (KR’98), pp.~2–13. Trento, Italy (1998)
4. Chaudhuri S., Dayal U.(1997): An overview of data warehousing and olap technology. SIGMOD Record 26(1): 65–74
5. Codd, E.: Providing OLAP (on-line analytical processing) to user-analysts: an IT mandate. Tech. rep., E.F. Codd and Associates (1993)