Raoul Medina Lhouari Nourine A Unified Hierarchy for Functional Dependencies, Conditional Functional Dependencies and Association Rules. 98-113 2009 ICFCA http://dx.doi.org/10.1007/978-3-642-01815-2_9 conf/icfca/2009 db/conf/icfca/icfca2009.html#MedinaN09