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https://www.oulu.fi/6gflagship/
. Accessed 28 June 2019
2. Hall, P.S., Hao, Y.: Antennas and Propagation for Body-Centric Wireless Communications, 2nd edn. Artech House, Norwood (2012)
3. United Nations: Department of Economic and Social Affairs, World Population Ageing (2017).
http://www.un.org/en/development/desa/population/publications/pdf/ageing/WPA2017_Highlights.pdf
. Accessed August 2019
4. Oppermann, I., Hämäläinen, M., Iinatti, J. (eds.): UWB Theory and Applications. Wiley, West Sussex (2004)
5. Ghawami, M., Michael, L.B., Kohno, R.: Ultra Wideband Signals and systEms in Communication Engineering, 2nd edn. Wiley, West Sussex (2007)