Stephen Lynn Yiu-Kai Ng Using Vagueness Measures to Re-rank Documents Retrieved by a Fuzzy Set Information Retrieval Model. 39-43 2008 FSKD (5) http://dx.doi.org/10.1109/FSKD.2008.546 conf/fskd/2008-5 db/conf/fskd/fskd2008-5.html#LynnN08