Gerd Kortuem, Christian Kray, Hans-Werner Gellersen. Sensing and visualizing spatial relations of mobile devices. In Patrick Baudisch, Mary Czerwinski, Dan R. Olsen, editors, Proceedings of the 18th Annual ACM Symposium on User Interface Software and Technology, Seattle, WA, USA, October 23-26, 2005. pages 93-102, ACM, 2005. [doi]
Abstract is missing.