R. Stecher, C. Niederée, and W. Nejdl. Proceeding of the 17th ACM conference on Information and knowledge management, page 797--806. New York, NY, USA, ACM, (2008)
S. Bethard, and D. Jurafsky. Proceedings of the 19th ACM international conference on Information and knowledge management, page 609--618. New York, NY, USA, ACM, (2010)
W. Müller, and H. Schumann. Proceedings of the 35th conference on Winter simulation: driving innovation, page 737--745. Winter Simulation Conference, (2003)