Kang Soo Tae Hee Yong Youn Gyung-Leen Park On Negation-Based Conscious Agent. 114-121 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3043&spage=114 2004 conf/iccsa/2004-1 ICCSA (1) db/conf/iccsa/iccsa2004-1.html#TaeYP04