title: engineering federated information systems : report of efis '99 workshop. authors: fèlix saltor , uwe hohenstein , ralf-detlef kutsche , wilhelm hasselbring , gunter saake , stefan conrad , mark roantree. venue: sigmod record. year: 1999
title: report on ngits ' 99 : the fourth international workshop on next generation information technologies and systems. authors: opher etzion. venue: acm sigmod record. year: 1999