@inproceedings{ITiCSE-1998-Astrachan,
	author        = "Owen L. Astrachan",
	booktitle     = "{Proceedings of the Sixth Annual Conference on the Teaching of Computing and Third Conference on Innovation and Technology in Computer Science Education}",
	doi           = "10.1145/282991.283003",
	isbn          = "1-58113-000-7",
	pages         = "21--24",
	publisher     = "{ACM}",
	title         = "{Concrete teaching: hooks and props as instructional technology}",
	year          = 1998,
}