db/conf/pdis/WeikumHMZ93.html Gerhard Weikum Christof Hasse Axel Mönkeberg Michael Rys Peter Zabback The COMFORT Project (Synopsis). 158-161 PDIS1993/P158.pdf 1993 conf/pdis/93 PDIS db/conf/pdis/pdis93.html#WeikumHMZ93