1. “What is 5G? 5G visions”. GSM history: history of GSM, mobile networks, vintage mobiles. Online: http://www.gsmhistory.com/5g/ . Accessed 14 June 2016
2. D Lopez-Perez, M Ding, H Claussen, AH Jafari, Towards 1 Gbps/UE in Cellular Systems: Understanding Ultra-Dense Small Cell Deployments. IEEE Commun. Surv. Tutorials 17(4):2078–2101 (2015). doi: 10.1109/COMST.2015.2439636
3. “Small cells—what’s the big idea? Femtocells are expanding beyond the home,” White Paper, Small Cell Forum, 2012. http://smallcellforum.org/smallcellforum/Files/File/SCF-Small_Cells_White_Paper.pdf
4. 3GPP, Telecommunication management; principles and high level requirements, TS 32.101, 3rd Generation Partnership Project (3GPP) (2015). http://www.3gpp.org/ftp/Specs/html-info/32101.htm
5. 3GPP, “Telecommunication management; self-organizing networks (SON); self-healing concepts and requirements,” 3rd Generation Partnership Project (3GPP), TS 32.541, 2016. http://www.3gpp.org/DynaReport/32541.htm