Supporting natural language interfaces for relational databases using RRA — A reshaped relational algebra: Yoav Raz Department of Computer Science, Technion — Israel Institute of Technology, Haifa, May 1986
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论文评审过程：Available online 19 May 2003.
论文官网地址：https://doi.org/10.1016/0167-9236(87)90133-3
