. . . . . . . . "In the related work section (p.24/25) Games with a Purpose are mentioned. There exist also games with the dedicated purpose of DBpedia quality check that have not been mentioned/compared [4]. [4] J. Waitelonis, N. Ludwig, M. Knuth, H. Sack: Whoknows? - Evaluating Linked Data Heuristics with a Quiz that cleans up DBpedia. International Journal of Interactive Technology and Smart Education (ITSE), Emerald Group, Bingley (UK), Vol. 8, 2011 (3)." . "3"^^ . . . . "2019-11-26T09:05:11+01:00"^^ . .