Michael Polanyi (1974) Personal Knowledge: Towards a Post-Critical Philosophy, ISBN0-226-67288-3, footnote page 10–11: Einstein reports, via Dr N Balzas in response to Polanyi's query, that "The Michelson–Morley experiment had no role in the foundation of the theory." and "..the theory of relativity was not founded to explain its outcome at all." [1]
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Lauginie, P. (2004). "Measuring Speed of Light: Why? Speed of what?"(PDF). Proceedings of the Fifth International Conference for History of Science in Science Education. Archived from the original(PDF) on 4 July 2015. Retrieved 3 July 2015.
Signell, Peter. "Appearances at Relativistic Speeds"(PDF). Project PHYSNET. Michigan State University, East Lansing, MI. Archived from the original(PDF) on 13 April 2017. Retrieved 12 April 2017.
Kraus, Ute. "The Ball is Round". Space Time Travel: Relativity visualized. Institut für Physik Universität Hildesheim. Archived from the original on 12 May 2017. Retrieved 16 April 2017.