F. Abel, N. Henze, и D. Krause. WWW '08: Proceeding of the 17th international conference on World Wide Web, стр. 1147--1148. New York, NY, USA, ACM, (2008)
F. Abel, N. Henze, и D. Krause. WWW '08: Proceeding of the 17th international conference on World Wide Web, стр. 1147--1148. New York, NY, USA, ACM, (2008)