Peter Becker 0002 Numerical Analysis in Conceptual Systems with ToscanaJ. 96-103 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2961&spage=96 2004 conf/icfca/2004 ICFCA db/conf/icfca/icfca2004.html#Becker04