Todd J. Green Grigoris Karvounarakis Zachary G. Ives Val Tannen Update Exchange with Mappings and Provenance. 675-686 2007 conf/vldb/2007 VLDB http://www.vldb.org/conf/2007/papers/research/p675-green.pdf db/conf/vldb/vldb2007.html#GreenKIT07