1. Arens, Yigal, Chin Chee, Chun-Nan Hsu, Hoh In, and Craig Knoblock: “Query Processing in an Information Mediator”; Proc. ARPA/Rome Laboratory Knowledge-Based Planning and Scheduling Initiative Workshop, Tucson AZ, Morgan Kaufmann, 1994.
2. Barsalou, Thierry and Gio Wiederhold: “Knowledge-directed Mediation Between Application Objects and Data”; Proc. Working Conf. on Data and Knowledge Integration, Un. of Keele, England, 1989, Pittman Pub.
3. Cattell, R. (ed): The Object Database Standard: ODMG (3 9version 1.1); Morgan Kaufman, May 1994.
4. ACM SIGMOD ’93;WW Chu,1993
5. Chu, W.W. and Q. Chen: “A Structured Approach for Cooperative Query Answering”; IEEE Transactions onKnowledge and Data Engineering, Vol.6 No.5, October 1994.