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"Query Graphs, Implementing Trees, and Freely-Reorderable Outerjoins."
Arnon Rosenthal, César A. Galindo-Legaria (1990)
- Arnon Rosenthal, César A. Galindo-Legaria:
Query Graphs, Implementing Trees, and Freely-Reorderable Outerjoins. SIGMOD Conference 1990: 291-299
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