A. Pilz, und G. Paaß. Proceedings of the 20th ACM International Conference on Information and Knowledge Management, Seite 857--866. New York, NY, USA, ACM, (2011)
X. Han, L. Sun, und J. Zhao. Proceedings of the 34th International ACM SIGIR Conference on Research and Development in Information Retrieval, Seite 765--774. New York, NY, USA, ACM, (2011)
O. Goga, H. Lei, S. Parthasarathi, G. Friedland, R. Sommer, und R. Teixeira. Proceedings of the 22Nd International Conference on World Wide Web, Seite 447--458. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2013)