I. Huvila, and K. Johannesson. Information Science and Social Media : Proceedings of the International Conference Information Science and Social Media ISSOME 2011, August 24-26, Åbo/Turku, Finland, volume 1 of Skrifter utgivna av Informationsvetenskap vid Åbo Akademi, page 99--106. Åbo Akademi, (2011)
C. Trabelsi, A. Jrad, and S. Yahia. Proceedings of the 2010 IEEE International Conference on Data Mining Workshops, page 369--379. Washington, DC, USA, IEEE Computer Society, (2010)
R. Abbasi, S. Chernov, W. Nejdl, R. Paiu, and S. Staab. Advances in Information Retrieval, volume 5478 of Lecture Notes in Computer Science, page 654--661. Springer Berlin / Heidelberg, (2009)