Elie Carton and Albert Einstein: Letters on Absolute Parallelism, 1929-32.
Edited By R. Debever.Translated by J. Ritter and J. Leroy. Pp. 233. (Princeton University Press: Princeton, New Jersey, and Guildford, UK, 1979.) £11.40.
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MacCallum, M. Unifying the forces of nature. Nature 284, 287 (1980). https://doi.org/10.1038/284287b0
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DOI: https://doi.org/10.1038/284287b0