L. von Ahn, and L. Dabbish. CHI '04: Proceedings of the SIGCHI conference on Human factors in computing systems, page 319--326. New York, NY, USA, ACM, (2004)
K. Bischoff, C. Firan, W. Nejdl, and R. Paiu. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge management, page 193--202. New York, NY, USA, ACM, (2008)
S. Sen, F. Harper, A. LaPitz, and J. Riedl. GROUP '07: Proceedings of the 2007 international ACM conference on Supporting group work, page 361--370. New York, NY, USA, ACM, (2007)
R. Kern, C. Körner, and M. Strohmaier. Proceedings of the 14th European conference on Research and advanced technology for digital libraries, page 461--465. Berlin, Heidelberg, Springer-Verlag, (2010)
A. Zubiaga, C. Körner, and M. Strohmaier. Proceedings of the 22nd ACM conference on Hypertext and hypermedia, page 93--102. New York, NY, USA, ACM, (2011)
C. Cattuto, D. Benz, A. Hotho, and G. Stumme. The Semantic Web -- ISWC 2008, Proc.Intl. Semantic Web Conference 2008, volume 5318 of LNAI, page 615--631. Heidelberg, Springer, (2008)