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, CIKM 2008, Napa Valley, California, USA, October 26-30, 2008, page 1429-1430. ACM, (2008)