http://www.pkuaa.org/

 http://www.pku.org/

 http://www.puaa-dc.org/

 http://www-acs.ucsd.edu/~pkuaa/

 http://www.stormloader.com/baa/index.html

 http://dolphin.upenn.edu/~pupa/

 http://www.webpku.com/

 http://www.cs.utexas.edu/users/xugang/apaa/

 http://www.dyna-inc.com/pku/pku.htm

 http://www.it.swin.edu.au/personal/mliu/pkuaa/