1. The semantic web;Berners-Lee;Scientific American,2001
2. Blood, R. (2005, January 18). Rebecca's pocket. Message posted to http://www.rebeccablood.net/archive/2005/01.html#11technorati
3. Butterfield, S. (2004, August 4). I am sharing this with you. Message posted to http://www.sylloge.com/personal/2004/08/folksonomy-social-classification-great.html
4. Support-vector networks;Cortes;Machine Learning,1995