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2. Department of Defense Policy (2023, December 12). U.S. Department of Defense Photographs and Imagery, Unless Otherwise Noted, Are in the Public Domain, Available online: https://www.defense.gov/Contact/Help-Center/Article/article/2762906/use-of-department-of-defense-imagery.
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4. NASA Image Use Policy (2023, October 08). NASA Content (Images, Videos, Audio, etc.) Are Generally Not Copyrighted and May Be Used for Educational or Informational Purposes without Needing Explicit Permissions, Available online: https://gpm.nasa.gov/image-use-policy.
5. Autonomy for Space Robots: Past, Present, and Future;Nesnas;Curr. Robot. Rep.,2021