@inproceedings{HT-2008-KetterlEB,
	author        = "Markus Ketterl and Johannes Emden and Jörg Brunstein",
	booktitle     = "{Proceedings of the 19th Conference on Hypertext and Hypermedia}",
	doi           = "10.1145/1379092.1379140",
	isbn          = "978-1-59593-985-2",
	pages         = "231--232",
	publisher     = "{ACM}",
	title         = "{Social selected learning content out of web lectures}",
	year          = 2008,
}