@inproceedings{KDIR-2009-HeyerHT,
	author        = "Gerhard Heyer and Florian Holz and Sven Teresniak",
	booktitle     = "{Proceedings of the First International Conference on Knowledge Discovery and Information Retrieval}",
	isbn          = "978-989-674-011-5",
	pages         = "223--228",
	publisher     = "{INSTICC Press}",
	title         = "{Change of Topics over Time — Tracking Topics by their Change of Meaning}",
	year          = 2009,
}