title: research and practice in federated information systems , report of the efis ' 2000 international workshop. authors: ralf-detlef kutsche , geert-jan houben , mark roantree , bodo rieger , wilhelm hasselbring , kazimierz subieta , willem-jan van den heuvel. venue: sigmod record. year: 2000
title: research and practice in federated information systems. authors: w. hasselbring , w.-j . van den heuvel , g. j. houben , r.-d . kutsche , b. rieger , m. roantree , k. subieta. venue: acm sigmod record. year: 2000