@inproceedings{RecSys-2008-DrachslerHK,
	author        = "Hendrik Drachsler and Hans G. K. Hummel and Rob Koper",
	booktitle     = "{Proceedings of the Second Conference on Recommender Systems}",
	doi           = "10.1145/1454008.1454058",
	isbn          = "978-1-60558-093-7",
	pages         = "303--306",
	publisher     = "{ACM}",
	title         = "{Navigation support for learners in informal learning environments}",
	year          = 2008,
}