Some important publications about "games with a purpose"

1. L. von Ahn: “Games with a purpose”. Computer, vol. 29(6), pp. 92–94, 2006.
2. L. von Ahn and L. Dabbish: “Labeling images with a computer game”. In proceedings of conference human factors in computing systems (CHI 04), ACM Press, pp. 319–326, 2004.
3. L. von Ahn: “Peekaboom: A game for locating objects in images”. In proceedings of conference human factors in computing systems (CHI06), ACM Press, pp. 55–64, 2006.
4. E. Law et al.: “Tagatune”. In proceedings of International Conference Music Information Retrieval (ISMIR 07), Austrian Computer Soc., pp.361–364, 2007.