M. Youssef, A. Agrawala, and A. Shankar. Pervasive Computing and Communications (PerCom).Proceedings of the
First IEEE International Conference, page 143--150. (2003)
S. Drucker, G. Petschnigg, and M. Agrawala. Proceedings of the 19th Annual ACM Symposium on User Interface Software and Technology, page 47-56. Montreux, Switzerland, (October 2006)