Vladia Pinheiro Elizabeth Furtado Vasco Furtado A Unified Architecture to Develop Interactive Knowledge Based Systems. 174-183 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3171&spage=174 2004 conf/sbia/2004 SBIA db/conf/sbia/sbia2004.html#PinheiroFF04