Yannis E. Ioannidis, Younkyung Cha Kang. Left-Deep vs. Bushy Trees: An Analysis of Strategy Spaces and its Implications for Query Optimization. In James Clifford, Roger King, editors, Proceedings of the 1991 ACM SIGMOD International Conference on Management of Data, Denver, Colorado, May 29-31, 1991. pages 168-177, ACM Press, 1991. [doi]
Abstract is missing.