@inproceedings{SIGMOD-2009-AulbachJKS,
	author        = "Stefan Aulbach and Dean Jacobs and Alfons Kemper and Michael Seibold",
	booktitle     = "{Proceedings of the 27th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1559845.1559941",
	isbn          = "978-1-60558-551-2",
	pages         = "881--888",
	publisher     = "{ACM}",
	title         = "{A comparison of flexible schemas for software as a service}",
	year          = 2009,
}