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Nature 257, 451-454 (9 October 1975) | doi:10.1038/257451a0

Letters from Einstein to de Sitter on the nature of the Universe

Carla Kahn & Franz Kahn*

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The correspondence between Einstein and de Sitter during 1916 and 1918, recently discovered in the archives of the Sterrewacht at Leiden provides a fascinating glimpse of the thinking of the two principal progenitors of modern cosmology.