F. Abel, N. Henze, and D. Krause. Proceedings of the 17th ACM Conference on Information and Knowledge Management, page 1429--1430. New York, NY, USA, ACM, (2008)
F. Abel, N. Henze, and D. Krause. Proceedings of the 17th ACM Conference on Information and Knowledge Management, page 1429--1430. New York, NY, USA, ACM, (2008)