I. Weber, V. Garimella, und A. Teka. Advances in Information Retrieval, Volume 7814 von Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2013)
M. Cameron, R. Power, B. Robinson, und J. Yin. Proceedings of the 21st International Conference on World Wide Web, Seite 695--698. New York, NY, USA, ACM, (2012)
S. Vieweg, A. Hughes, K. Starbird, und L. Palen. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, Seite 1079--1088. New York, NY, USA, ACM, (2010)