Jun Rao, Hamid Pirahesh, Calisto Zuzarte. Canonical Abstraction for Outerjoin Optimization. In Gerhard Weikum, Arnd Christian König, Stefan Deßloch, editors, Proceedings of the ACM SIGMOD International Conference on Management of Data, Paris, France, June 13-18, 2004. pages 671-682, ACM, 2004. [doi]
Abstract is missing.