Salvatore Greco Benedetto Matarazzo Roman Slowinski Rule-Based Decision Support in Multicriteria Choice and Ranking. 29-47 2001 conf/ecsqaru/2001 ECSQARU http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2143&spage=0029 db/conf/ecsqaru/ecsqaru2001.html#GrecoMS01