S. Dumais, G. Buscher, und E. Cutrell. Proceeding of the third symposium on Information interaction in context, Seite 185--194. New York, NY, USA, ACM, (2010)
K. Lamm, T. Mandl, und R. Koellex. Proceedings of the 10th cross-language evaluation forum conference on Multilingual information access evaluation: text retrieval experiments, Seite 538--543. Berlin, Heidelberg, Springer-Verlag, (2009)