CRAVEN, M., TAYLOR, I., DROZD, A., PURBRICK, J., GREENHALGH, C., BENFORD, S., FRASER, M., BOWERS, J., J脛脛-ARO, K., LINTERMANN, B. and HOCH, M., 2001. In: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, Seattle, United States, 31 March - 5 April. 30-37