@incollection{ author={Lioma, Christina and Blanco, Roi and Mochales Palau, Raquel and Moens, Marie-Francine}, title={A Belief Model of Query Difficulty That Uses Subjective Logic}, year={2009}, isbn={978-3-642-04416-8}, booktitle={Advances in Information Retrieval Theory}, volume={5766}, series={Lecture Notes in Computer Science}, editor={Azzopardi, Leif and Kazai, Gabriella and Robertson, Stephen and RĂ¼ger, Stefan and Shokouhi, Milad and Song, Dawei and Yilmaz, Emine}, doi={10.1007/978-3-642-04417-5_9}, url={http://dx.doi.org/10.1007/978-3-642-04417-5_9}, publisher={Springer Berlin Heidelberg}, pages={92--103} }