Browne, P. J. R. (1920). The principle of relativity and Einstein's law of gravitation.
Lua i Stíl Chicago (17ú heag.)Browne, Patrick J. Rev. The Principle of Relativity and Einstein's Law of Gravitation. 1920.
Lua MLA (9ú heag.)Browne, Patrick J. Rev. The Principle of Relativity and Einstein's Law of Gravitation. 1920.
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