title: semantic and pedagogic interoperability mechanisms in the ariadne educational repository. authors: erik duval , eddy forte , kris cardinaels , koen hendrikx , florence haenni , maria wentland forte , florence simillion , ken warkentyne , e. vervaet. venue: sigmod record. year: 1999
title: semantic interoperability in global information systems. authors: a. m. ouksel , a. sheth. venue: acm sigmod record. year: 1999