db/conf/krdb/HughesMR97.html Eric Hughes Daryl Morey Arnon Rosenthal Quality of Service in Knowledge Collection and Management. 9.1-9.3 1997 conf/krdb/97 KRDB db/conf/krdb/krdb97.html#HughesMR97 KRDB1997/X09.pdf http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-8/paper-9.ps