S. Bloehdorn, P. Cimiano, A. Duke, P. Haase, J. Heizmann, I. Thurlow, and J. Völker. Research and Advanced Technology for Digital Libraries --- Proceedings of the 11th European Conference on Research and Advaced Technologies for Digital Libraries (ECDL 2007), September 16-21, 2007, Budapest, Hungary, 4675, Springer, Berlin--Heidelberg, Germany, (2007)