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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1943 Aug;29(8):231–239. doi: 10.1073/pnas.29.8.231

Matter, Electricity and Gravitation in Flat Space-Time

George D Birkhoff 1
PMCID: PMC1078600  PMID: 16578082

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