F. Abel, E. Herder, I. Marenzi, W. Nejdl, и S. Zerr. 2nd Annual Workshop on Search in Social Media (SSM '09), co-located with ACM SIGIR 2009 Conference on Information Retrieval, Boston, USA, (июля 2009)
F. Abel, N. Henze, и D. Krause. Web Information Systems and Technologies, 5th International Conference, WEBIST 2009, Lisbon, Portugal, March 23-26, 2009, Revised Selected Papers, том 45 из Lecture Notes in Business Information Processing, стр. 113-127. Springer, (2010)