1. Eakins , J.P. Graham , M.E. 1999 Content-based image retrieval (JISC Technology Applications Programme Report 39) http://www.jisc.ac.uk/media/documents/programmes/jtap/jtap-039.pdf
2. The vocabulary problem in human-system communication;Furnas;Communications of the ACM,1987
3. Tagging video
4. Social bookmarking, folksonomies, and Web 2.0 Tools;Gordon-Murnane;Searcher,2006