1. Poslad, S.: Ubiquitous Computing: Smart Devices, Environments and Interactions. Wiley (2009) ISBN: 978-0-470-03560-3
2. Valhouli, C.A.: The Hammersmith Group, The Internet of things: Networked objects and smart devices, the hammersmith group research report (February 2010)
3. Katz, R.H., Brewer, E.A.: The Case for Wireless Overlay Networks, pp. 621–650. Kluwer Academic Publishers (1996)
4. Harte, L., Prokup, S.,, R.: Cellular and PCS, pp. 118–121. McGrawHill (1997)
5. Lee, T., Hwang, C.-S.: An Enhanced Wireless Network Architecture for Future Communication Environments. In: the 3rd WPMC 2000, pp. 491–496 (November 2000)