P. Haase, and B. Motik. IHIS 05: Proceedings of the first international workshop on Interoperability of heterogeneous information systems, page 9-16. ACM Press, (November 2005)
G. Wagner, G. Antoniou, S. Tabet, and H. Boley. WI '04: Proceedings of the Web Intelligence, IEEE/WIC/ACM International Conference on (WI'04), page 628--631. Washington, DC, USA, IEEE Computer Society, (2004)
S. Brockmans, P. Haase, P. Hitzler, and R. Studer. The Semantic Web: Research and Applications, volume 4011 of LNCS, page 303-316. Budva, Montenegro, Springer, (June 2006)