Database description with SDM: a semantic database model
ACM Transactions on Database Systems (TODS)
Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
Developing a natural language interface to complex data
ACM Transactions on Database Systems (TODS)
A Flexible Notation for Syntactic Definitions
ACM Transactions on Programming Languages and Systems (TOPLAS)
An English language question answering system for a large relational database
Communications of the ACM
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