A. Aschenbrenner, M. Kuster, C. Ludwig, and T. Vitt. Digital Ecosystems and Technologies, 2009. DEST '09. 3rd IEEE International Conference on, page 745 -750. (June 2009)
S. Benkler, N. Chavannes, and N. Kuster. International Workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications (IWAT '07), page 475--478. (2007)