A social database about things you know and love, spanning millions of topics in thousands of categories. Explore Freebase, add to it, or build applications with it.
J. Kamps, S. Geva, A. Trotman, A. Woodley, and M. Koolen. Advances in Focused Retrieval: 7th International Workshop of the Initiative for the Evaluation of XML Retrieval (INEX 2008), volume 5631 of LNCS, page 1--28. Springer Verlag, Berlin, Heidelberg, (2009)