1. Wiederhold, G.: Mediators in the architecture of future information systems. Computer 25(3), 38–49 (1992)
2. Collet, C., Huhns, M., Shen, W.-M.: Resource integration using a large knowledge base in carnot. Computer 24(12), 55–62 (1991)
3. Arens, Y., Knoblock, C.-A., Shen, W.-M.: Query reformulation for dynamic information integration. Journal of Intelligent Information Systems - Special Issue on Intelligent Information Integration 6(2/3), 99–130 (1996)
4. Mena, E., Kashyap, V., Sheth, A.-P., Illarramendi, A.: OBSERVER: An approach for query processing in global information systems based on interoperation across pre-existing ontologies. In: Conference on Cooperative Information Systems, pp. 14–25 (1996)
5. Calvanese, D., De Giacomo, G., Lenzerini, M., Nardi, D., Rosati, R.: Schema and data integration methodology for DWQ. Technical Report DWQ-UNIROMA-004, Dipartimento di Informatica Sistemistica, Universita‘ di Roma La Sapienza (1998)