Y. Li, G. Kennedy, F. Davies, und J. Hunter. Proceedings of the role of digital libraries in a time of global change, and 12th international conference on Asia-Pacific digital libraries, Seite 179--188. Berlin, Heidelberg, Springer-Verlag, (2010)
Y. Sure, S. Bloehdorn, P. Haase, J. Hartmann, und D. Oberle. Proceedings of the 12th Portuguese Conference on Artificial Intelligence - Progress in Artificial Intelligence (EPIA 2005), Volume 3803 von LNCS, Seite 218 - 231. Covilha, Portugal, Springer, (Dezember 2005)