Jidi Zhao Harold Boley Weichang Du Knowledge Representation and Consistency Checking in a Norm-Parameterized Fuzzy Description Logic. 111-123 2009 ICIC (2) http://dx.doi.org/10.1007/978-3-642-04020-7_13 conf/icic/2009-2 db/conf/icic/icic2009-2.html#ZhaoBD09