J. Mori, Y. Matsuo, H. Koshiba, K. Aihara, and H. Takeda. User Modeling, Adaptation, and Personalization: 17th International Conference, UMAP 2009, formerly UM and AH, Trento, Italy, volume 5535 of Lecture Notes in Computer Science, Springer, Berlin, (2009)
M. Müller. Privacy and Identity Management for Emerging Services and Technologies, volume 421 of IFIP Advances in Information and Communication Technology, Springer, Heidelberg, (2015)