1. NGMN Alliance, 5G End-to-End Architecture Framework, v3.0.8, Technical Report, 2019.
2. ETSI NFV ISG, Network Function Virtualisation (NFV): Management and Orchestration: Report on architecture options to support multiple administrative domains, ETSI GR NFV-IFA 28, 2018.
3. ITU-T FG-NET2030, Network 2030 Architecture Framework, Tech. Spec., 2020.
4. R.V. Rosa, M.A.S. Santos, C.E. Rothenberg, MD2-NFV: The case for multi-domain distributed network functions virtualization, in: International Conference and Workshops on Networked Systems, 2015, pp. 1–5.
5. Optimal virtual network function placement in multi-cloud service function chaining architecture;Bhamare;Comput. Commun.,2017