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)
R. Abbasi, M. Grzegorzek, and S. Staab. Semantic Multimedia, volume 5887 of Lecture Notes in Computer Science, page 65--76. Springer Berlin / Heidelberg, (2009)
D. Abrams, R. Baecker, and M. Chignell. Proceedings of the SIGCHI conference on Human factors in computing systems, page 41-48. New York, NY, USA, ACM Press/Addison-Wesley Publishing Co., (1998)