http://www.experience-planner.com/2009/08/25/faceted-search-results/

http://www.uie.com/events/virtual_seminars/facets/FacetedSearchVS35Handout.pdf

http://flowingdata.com/2008/03/05/why-does-data-matter-to-google/

 

Closer: Carrot

http://project.carrot2.org/

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