title: semantic interoperability in global information systems : a brief introduction to the research area and the special section. authors: amit p. sheth , aris m. ouksel. venue: sigmod record. year: 1999
title: semantic and pedagogic interoperability mechanisms in the ariadne educational repository. authors: e. forte , f. haenni , k. warkentyne , e. duval , k. cardinaels , e. vervaet , k. hendrikx , m. wentland forte , f. simillion. venue: acm sigmod record. year: 1999