Comparative Evaluation of Focused Retrieval 9th International Workshop of the Inititative for the Evaluation of XML Retrieval, INEX 2010, Vugh, The Netherlands, December 13-15, 2010, Revised Selected Papers - Geva, Shlomo; Kamps, Jaap; Schenkel, Ralf; Trotman, Andrew (Springer Berlin Heidelberg, 2011)