1. A layer architecture for the integration of rules, inheritance, and constraints;Abecker,1994
2. Towards the meaning of LIFE;Aït-Kaci,1991
3. Query reformulation for dynamic information integration;Arens;International Journal on Intelligent and Cooperative Information Systems,1996
4. Cardinality restrictions on concepts;Baader;Artificial Intelligence,1996
5. A terminological knowledge representation system with complete inference algorithm;Baader,1991