Alkis Simitsis Kevin Wilkinson Malú Castellanos Umeshwar Dayal QoX-driven ETL design: reducing the cost of ETL consulting engagements. 953-960 2009 SIGMOD Conference http://doi.acm.org/10.1145/1559845.1559954 conf/sigmod/2009 db/conf/sigmod/sigmod2009.html#SimitsisWCD09