المؤلفون: Grobe, L., Paraskevopoulos, A., Hilt, J., Schulz, D., Lassak, F., Hartlieb, F., Kottke, C., Jungnickel, V., Langer, K.-D.

المصدر: IEEE Communications Magazine IEEE Commun. Mag. Communications Magazine, IEEE. 51(12):60-66 Dec, 2013