@article {2015,
	title = {Self-Enriching Ontology-Based Casual Learning Games},
	journal = {COMPUTING AND INFORMATICS},
	volume = {34},
	year = {2015},
	pages = {652{\textendash}677},
	author = {Malzahn, Nils and Ziebarth, Sabrina and Kloke, Dominik and Hoppe, H Ulrich}
}
