Xiaocheng Luan Yun Peng Timothy W. Finin Learning in the Broker Agent. 106-124 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2564&spage=106 2002 conf/wrac/2002 WRAC db/conf/wrac/wrac2002.html#LuanPF02