@inproceedings{VLDB-2005-GraupmannSW,
	author        = "Jens Graupmann and Ralf Schenkel and Gerhard Weikum",
	booktitle     = "{Proceedings of the 31st International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb2005.org/program/paper/thu/p529-graupmann.pdf",
	isbn          = "['1-59593-154-6', '1-59593-177-5']",
	pages         = "529--540",
	publisher     = "{ACM}",
	title         = "{The SphereSearch Engine for Unified Ranked Retrieval of Heterogeneous XML and Web Documents}",
	year          = 2005,
}