Alessandro F. Garcia Cláudio Sant'Anna Christina Chavez Viviane Torres da Silva Carlos José Pereira de Lucena Arndt von Staa Separation of Concerns in Multi-agent Systems: An Empirical Study. 49-72 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2940&spage=49 2003 conf/selmas/2003 SELMAS db/conf/selmas/selmas2003.html#GarciaSCSLS03