@inproceedings{ITiCSE-2009-SchluterB,
	author        = "Kirsten Schlüter and Torsten Brinda",
	booktitle     = "{Proceedings of the 14th Conference on Innovation and Technology in Computer Science Education}",
	doi           = "10.1145/1562877.1562999",
	isbn          = "978-1-60558-381-5",
	pages         = "357",
	publisher     = "{ACM}",
	title         = "{The attributes of task difficulty in informatics in secondary education: first results of an empirical study}",
	year          = 2009,
}