System R: relational approach to database management
ACM Transactions on Database Systems (TODS)
Operating statistics for the transformational question answering system
Computational Linguistics
Field testing the Transformational Question Answering (TQA) system
ACL '81 Proceedings of the 19th annual meeting on Association for Computational Linguistics
Natural language for expert systems: comparisons with database systems
ACL '84 Proceedings of the 10th International Conference on Computational Linguistics and 22nd annual meeting on Association for Computational Linguistics
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