@inproceedings{SIGMOD-1985-SellisS,
	author        = "Timos K. Sellis and Leonard D. Shapiro",
	booktitle     = "{Proceedings of the 15th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD85/P424.PDF",
	doi           = "10.1145/318898.318993",
	pages         = "424--436",
	publisher     = "{ACM Press}",
	title         = "{Optimization of Extended Database Query Languages}",
	year          = 1985,
}