D. Cox, V. Kindratenko, und D. Pointer. UbiComp 2003: Ubiquitous Computing, Volume 2864 von Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2003)
N. Koeppen, K. Polkehn, und H. Wandke. Measuring Behavior 2002, 4th International Cofnerence on
Methods and Techniques in Behavioral Research, 27-30 August 2002, Amsterdam, (2002)