Salvatore Greco Benedetto Matarazzo Roman Slowinski A New Rough Set Approach to Multicriteria and Multiattribute Classification. 60-67 1998 conf/rsctc/1998 Rough Sets and Current Trends in Computing http://link.springer.de/link/service/series/0558/bibs/1424/14240060.htm db/conf/rsctc/rsctc1998.html#GrecoMS98