P. Knees, T. Pohle, M. Schedl, D. Schnitzer, and K. Seyerlehner. Advances in information retrieval. Proceedings of th 30th European Conference on IR Research, ECIR 2008, page 627--631. Heidelberg, Springer, (2008)
S. Dornbush, A. Joshi, Z. Segall, and T. Oates. Proceeding of the 2007 conference on Advances in Ambient Intelligence, page 107--122. Amsterdam, The Netherlands, The Netherlands, IOS Press, (2007)