@article{VLDB-2011-MoerkotteN,
	author        = "Guido Moerkotte and Thomas Neumann",
	ee            = "http://www.vldb.org/pvldb/vol4/p843-moerkotte.pdf",
	journal       = "{Proceedings of the VLDB Endowment}",
	number        = 11,
	pages         = "843--851",
	title         = "{Accelerating Queries with Group-By and Join by Groupjoin}",
	volume        = 4,
	year          = 2011,
}