title: database research at the university of oklahoma. authors: sirirut vanichayobon , leonard brown , ravi a. dirckze , sylvain guinepain , carlos sánchez , le gruenwald , brian summers. venue: sigmod record. year: 1999
title: the database group at national technical university of athens ( ntua ). authors: corporate national technical univ. of athens. venue: acm sigmod record. year: 1995