A. Möller, M. Kranz, R. Huitl, S. Diewald, and L. Roalter. Proceedings of the 11th International Conference on Mobile and Ubiquitous Multimedia, page 4:1--4:10. New York, NY, USA, ACM, (2012)
A. Bekkali, H. Sanson, and M. Matsumoto. Wireless and Mobile Computing, Networking and Communications, 2007. WiMOB 2007. Third IEEE International Conference on, page 21 -21. (2007)