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References
- ↑ "Relativity in the Films" (PDF). Scientific American. August 1922. Retrieved July 14, 2008.
- ↑ Die Grundlagen der Einsteinschen Relativitäts-Theorie at IMDb
- ↑ "Re: First animated feature ever". Archived from the original on December 31, 2006. Retrieved April 7, 2009.
