Nick Koudas Avishek Saha Divesh Srivastava Suresh Venkatasubramanian Metric Functional Dependencies. 1275-1278 2009 ICDE http://dx.doi.org/10.1109/ICDE.2009.219 conf/icde/2009 db/conf/icde/icde2009.html#KoudasSSV09