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https://www.apple.com/apple-vision-pro/
2. The Khronos Group, OpenXR, available: https://www.khronos.org/openxr/
3. Valve, OpenVR, Steamworks Documentation, available: https://partner.steamgames.com/doc/features/steamvr/openvr
4. S.Li, Notification System for Unity OpenXR, dissertion, California
Polytechnic State University, 2023
5. M.Huzaifa et al., ILLIXR: An Open Testbed to Enable Extended Reality
Systems Research, IEEE Micro, 42(4):97-106, 2024 10.1109/MM.2022.3161018