1. Ball, M.: The metaverse: and how it will revolutionize everything. Liveright Publishing; W.W. Norton & Company, New York (2022)
2. Tucci, L., Needle, D.: What is the metaverse? An explanation and in-depth guide, WhatIs.com, downloaded, 26 February 2023 (2022). https://www.techtarget.com/whatis/feature/The-metaverse-explained-Everything-you-need-to-know?vgnextfmt=print
3. Bitkom: Augmented und Virtual Reality. Potenziale und praktische Anwendung immersiver Technologien. Bitkom, Berlin (2021)
4. Li, K., et al. When internet of things meets metaverse: convergence of physical and cyber worlds, Cornell University, 26 February 2023 (2022). https://arxiv.org/abs/2208.13501
5. Hamzaoui, M.A., Julien, N.: social cyber-physical systems and digital twins networks: a perspective about the future digital twin ecosystems. IFAC-PapersOnLine 55(8), 31–36 (2022)