D. Helic, C. Trattner, M. Strohmaier, and K. Andrews. Proceedings of the 2010 IEEE Second International Conference on Social Computing, page 161--168. Washington, DC, USA, IEEE Computer Society, (2010)
C. Trattner, C. Körner, and D. Helic. Proceedings of the 11th International Conference on Knowledge Management and Knowledge Technologies, page 18:1--18:8. New York, NY, USA, ACM, (2011)