@inproceedings{ITiCSE-2001-Koppelman,
	author        = "Herman Koppelman",
	booktitle     = "{Proceedings of the Sixth Conference on Innovation and Technology in Computer Science Education}",
	doi           = "10.1145/377435.377712",
	isbn          = "1-58113-330-8",
	pages         = "191",
	publisher     = "{ACM}",
	title         = "{Teaching abstraction explicitly}",
	year          = 2001,
}