A. Castellani, N. Bui, P. Casari, M. Rossi, Z. Shelby, and M. Zorzi. PerCom 2010 Workshops: Proceedings of the 8th Annual IEEE International Conference on Pervasive Computing and Communications Workshops, Mannheim, Germany, page 678-683. (2010)
L. Chen, J. Hoey, C. Nugent, D. Cook, and Z. Yu. IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews, 42 (6):
790-808(November 2012)