Gautam Bhargava, Piyush Goel, Balakrishna R. Iyer. Simplification of outer joins. In Dennis Bockus, Karen Bennet, W. Morven Gentleman, J. Howard Johnson, Evelyn Kidd, editors, Proceedings of the 1995 Conference of the Centre for Advanced Studies on Collaborative Research, November 7-9, 1995, Toronto, Ontario, Canada. pages 7, IBM, 1995. [doi]