@inproceedings{SIGMOD-2006-Cohen,
	author        = "Sara Cohen",
	booktitle     = "{Proceedings of the 24th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1142473.1142480",
	isbn          = "1-59593-256-9",
	pages         = "49--60",
	publisher     = "{ACM}",
	title         = "{User-defined aggregate functions: bridging theory and practice}",
	year          = 2006,
}