@inproceedings{SIGMOD-1994-KemperMPS,
	author        = "Alfons Kemper and Guido Moerkotte and Klaus Peithner and Michael Steinbrunn",
	booktitle     = "{Proceedings of the 24th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD94/P336.PDF",
	doi           = "10.1145/191839.191906",
	pages         = "336--347",
	publisher     = "{ACM Press}",
	title         = "{Optimizing Disjunctive Queries with Expensive Predicates}",
	year          = 1994,
}