1. http://www.hamilton.ie/pubs_Zhang.htm
3. http://portal.acm.org/citation.cfm?id=936868&coll=GUIDE&dl=GUIDE&CFID=53842129&CFTOKEN=88274054
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4. http://www.bsmee.be/events/ISMCR2005/SESSIONS7.pdf
5. http://vlab.ee.nus.edu.sg/~elezyn/
6. http://www2.acae.cuhk.edu.hk/~cil/people.htm