Cristina Coppola Gennaro Costagliola Sergio Di Martino Filomena Ferrucci Tiziana Pacelli A Fuzzy-Based Distance to Improve Empirical Methods for Menu Clustering. 59-64 2006 conf/iceis/2006 ICEIS (5) db/conf/iceis/iceis2006-5.html#CoppolaCMFP06