The principle of relativity : a collection of original memoirs on the special and general theory of relativity : Lorentz, H. A. (Hendrik Antoon), 1853-1928 : Free Download, Borrow, and Streaming : Internet Archive
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Einstein's General Theory of Relativity: With Modern Applications in Cosmology: Grøn, Øyvind, Hervik, Sigbjorn: 9780387691992: Amazon.com: Books
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New measurements of the solar spectrum verify Einstein's theory of General Relativity | Instituto de Astrofísica de Canarias • IAC
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