Rubén Fuentes Jorge J. Gómez-Sanz Juan Pavón Activity Theory for the Analysis and Design of Multi-agent Systems. 110-122 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2935&spage=110 2003 conf/aose/2003 AOSE db/conf/aose/aose2003.html#FuentesGP03