Lin Fu Dion Hoe-Lian Goh Schubert Shou-Boon Foo Evaluation of a Collaborative Querying System. 502-503 2005 conf/ercimdl/2005 ECDL http://dx.doi.org/10.1007/11551362_55 db/conf/ercimdl/ecdl2005.html#FuGF05