Alkis Simitsis Panos Vassiliadis Umeshwar Dayal Anastasios Karagiannis Vasiliki Tziovara Benchmarking ETL Workflows. 199-220 2009 TPCTC http://dx.doi.org/10.1007/978-3-642-10424-4_15 conf/tpctc/2009 db/conf/tpctc/tpctc2009.html#SimitsisVDKT09