Leonard D. Shapiro David Maier Paul Benninghoff Keith Billings Yubo Fan Kavita Hatwal Quan Wang Yu Zhang Hsiao-min Wu Bennet Vance Exploiting Upper and Lower Bounds In Top-Down Query Optimization. 20-33 2001 conf/ideas/2001 IDEAS db/conf/ideas/ideas2001.html#ShapiroMBBFHWZWV01