Laura Giordano Valentina Gliozzi Nicola Olivetti Gian Luca Pozzato Reasoning about Typicality in Preferential Description Logics. 192-205 2008 JELIA http://dx.doi.org/10.1007/978-3-540-87803-2_17 conf/jelia/2008 db/conf/jelia/jelia2008.html#GiordanoGOP08