Christine Collet Thierry Coupaye Luc Fayolle Claudia Roncancio 581 ICDE97/P581.pdf 1997 ICDE db/conf/icde/icde97.html#ColletCFR97 conf/icde/97 db/conf/icde/ColletCFR97.html conf/dexa/ColletC96 conf/vldb/ColletCS94