1. 3GPP TR 21.905: Vocabulary for 3GPP Specifications (2021). https://www.etsi.org/deliver/etsi_tr/121900_121999/121905/04.05.00_60/tr_121905v040500p.pdf. Last Accessed on 2 June 2021
2. 3GPP TS 23.501: System Architecture for the 5G System; Stage 2 (2021). https://www.etsi.org/deliver/etsi_ts/123500_123599/123501/15.03.00_60/ts_123501v150300p.pdf. Last Accessed on 2 June 2021
3. 3GPP TS 23.502: Procedure for the 5G System; Stage 2 (2021). https://www.3gpp.org. Last Accessed on 2 June 2021
4. 3GPP TS 29.522: 5G System; Network Exposure Function Northbound APIs; Stage 3 (2021). https://www.etsi.org/deliver/etsi_ts/129500_129599/129522/15.02.00_60/ts_129522v150200p.pdf. Last Accessed on 2 June 2021
5. 3GPP TS 29.122: T8 reference point for northbound Application Programming Interfaces (APIs) (2021). https://datasheets.globalspec.com/ps/5943/3GPP/7D0DEFED-ED87-470F-9A37-1AA34EC7565E. Last Accessed on 1 June 2021