@inproceedings{ITiCSE-2006-PerrenetK,
	author        = "Jacob Perrenet and Eric Kaasenbrood",
	booktitle     = "{Proceedings of the 11th Conference on Innovation and Technology in Computer Science Education}",
	doi           = "10.1145/1140124.1140196",
	isbn          = "1-59593-055-8",
	pages         = "270--274",
	publisher     = "{ACM}",
	title         = "{Levels of abstraction in students’ understanding of the concept of algorithm: the qualitative perspective}",
	year          = 2006,
}