1. 3GPP. 2013. Technical Specification Group Services and System Aspects; Feasibility Study for Proximity Services (ProSe); TR 22.803. Technical Report. Third Generation Partnership Project (3GPP). http://www.3gpp.org/DynaReport/22803.htm
2. 3GPP. 2015. Technical Specification Group Radio Access Network; Study on LTE Device to Device Proximity Services; Radio Aspects; TR 36.843. Technical Report. Third Generation Partnership Project (3GPP). http://www.3gpp.org/DynaReport/36843.htm
3. 3GPP. 2016. Technical Specification Group Core Network and Terminals; Numbering, Addressing and Identification; TS 23.003. Technical Report. Third Generation Partnership Project (3GPP). http://www.3gpp.org/DynaReport/23003.htm
4. 3GPP. 2016. Technical Specification Group Core Network and Terminals; Proximity-services (ProSe) User Equipment (UE) to ProSe Function Protocol Aspects; Stage 3; TS 24.334. Technical Report. Third Generation Partnership Project (3GPP). http://www.3gpp.org/DynaReport/24334.htm
5. 3GPP. 2016. Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures; TS 36.213. Technical Report. Third Generation Partnership Project (3GPP). http://www.3gpp.org/DynaReport/36213.htm