Li, J., Chang, S., Lesk, M., Lienhart, R., Luo, J., and Smeulders, A., “New challenges in multimedia information research for the increasingly connected and fast growing digital society,” ACM Multimedia Information Retrieval Conference, 5, 2, pp. 3-10, ACM Press, Augsburg, Germany (2007). See http://www.academiccommons.org/commons/essay/michael-lesk.