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: engineering federated information systems : report of eefis '99 workshop. authors: s. conrad , w. hasselbring , u. hohenstein , r.-d . kutsche , m. roantree , g. saake , f. saltor. venue: acm sigmod record. year: 1999