P. Lobo, T. Romão, A. Dias, and J. Danado. Ambient Intelligence: European Conference, AmI 2009, Salzburg, Austria, volume 5859 of Lecture Notes in Computer Science, Springer, Berlin, (2009)
F. Kerber, and P. Lessel. Proceedings of DeLFI Workshops 2015, co-located with 13th e-Learning Conference of the German Computer Society (DeLFI-15), Munich, Germany, volume 1443 of CEUR Workshop Proceedings, page 28--35. RWTH Aachen, Sun SITE Central Europe, (2015)