D. Milne, und I. Witten. Proceedings of the 17th ACM Conference on Information and Knowledge Management, Seite 509--518. New York, NY, USA, ACM, (2008)
D. Milne, und I. Witten. Proceedings of the 17th ACM conference on Information and knowledge management, Seite 509--518. New York, NY, USA, ACM, (2008)