P. Seitlinger, D. Kowald, C. Trattner, and T. Ley. Proceedings of the 22nd ACM international conference on Conference on information &\#38; knowledge management, page 2381--2386. New York, NY, USA, ACM, (2013)
K. Schoefegger, P. Seitlinger, and T. Ley. It’s about time: Exploring temporality in group learning. Alpine Rendez-Vous, Garmisch-Partenkirchen, December 2009, (2009)
P. Heymann, G. Koutrika, and H. Garcia-Molina. WSDM '08: Proceedings of the International Conference on Web Search and Web Data Mining, page 195--206. New York, NY, USA, ACM, (February 2008)
P. Heymann, G. Koutrika, and H. Garcia-Molina. WSDM '08: Proceedings of the International Conference on Web Search and Web Data Mining, page 195--206. New York, NY, USA, ACM, (2008)