1. Knowledge mining by imprecise querying: A classification-based approach;Anwar,1992
2. Cooperative QUERY answering via type abstraction hierarchy;Chu,1990
3. Cooperative responses to boolean queries;Corella,1984
4. Cooperative answering: A methodology to provide intelligent access to databases;Cuppens,1988
5. ARES: A relational database with the capability of performing flexible interpretation of queries;Ichikawa;IEEE Trans. on Software Engineering,1986