M. Hogan, G. Silvestre, and N. Hurley. Security, Steganography, and Watermarking of Multimedia Contents, volume 5306 of Proceedings of SPIE, page 58-69. SPIE, (2004)
A. Harth, J. Umbrich, A. Hogan, and S. Decker. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 211--224. Berlin, Heidelberg, Springer Verlag, (November 2007)