F. Abel, N. Henze, and D. Krause. Proceeding 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. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge mining, page 1429--1430. New York, NY, USA, ACM, (2008)