@inproceedings{SIGMOD-1997-Kramer,
	author        = "Ralf Kramer",
	booktitle     = "{Proceedings of the 27th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD97/P503.PDF",
	doi           = "10.1145/253260.253372",
	pages         = "503--506",
	publisher     = "{ACM Press}",
	title         = "{Databases on the Web: Technologies for Federation Architectures and Case Studies}",
	year          = 1997,
}