Lutz Schlesinger Wolfgang Lehner Extending data warehouses by semiconsistent views. 43-51 2002 conf/dmdw/2002 DMDW http://SunSITE.Informatik.RWTH-Aachen.de/Publications/CEUR-WS/Vol-58/schlesinger.pdf db/conf/dmdw/dmdw2002.html#SchlesingerL02