title: report on the 13th brazilian symposium on database systems ( sbbd ' 98 ). authors: claudia bauzer medeiros , mario a. nascimento. venue: sigmod record. year: 1999
title: report on the 13th brazilian symposium on database systems ( sbbd ' 98 ). authors: mario a. nascimento , claudia bauzer medeiros. venue: acm sigmod record. year: 1999