Georgia Pinto Barbosa Fabio Q. B. da Silva An Electronic Marketplace Architecture Based on Technology of Intelligent Agents and Knowledge. 39-60 2001 conf/ecAgents/2001 E-Commerce Agents http://link.springer.de/link/service/series/0558/bibs/2033/20330039.htm db/conf/ecAgents/ecAgents2001.html#BarbosaS01