title: database research at the university of oklahoma l gruenwald , l brown , r dirckze , s guinepain , c sсnchez , b summers , s vanichayobon. authors: nan. venue: sigmod record. year: 1999.0
title: database research at the university of twente 1993.0. authors: pmg apers , h balsters , hm blanken , ra de by , maw. venue: acm sigmod record ,. year: nan