Claudio Masolo Laure Vieu Emanuele Bottazzi Carola Catenacci Roberta Ferrario Aldo Gangemi Nicola Guarino Social Roles and their Descriptions. 267-277 2004 conf/kr/2004 KR db/conf/kr/kr2004.html#MasoloVBCFGG04 http://www.aaai.org/Library/KR/2004/kr04-029.php