@inproceedings{ITiCSE-2011-OliveiraMR,
	author        = "Osvaldo Luiz Oliveira and Ana María Monteiro and Norton Trevisan Roman",
	booktitle     = "{Proceedings of the 16th Conference on Innovation and Technology in Computer Science Education}",
	doi           = "10.1145/1999747.1999797",
	isbn          = "978-1-4503-0697-3",
	pages         = "173--177",
	publisher     = "{ACM}",
	title         = "{From concrete to abstract?: problem domain in the learning of introductory programming}",
	year          = 2011,
}