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Cartan, Elie, 1869-1951.
Elie Cartan-Albert Einstein : letters on absolute parallelism, 1929-1932 / original text, English translation by Jules Leroy and Jim Ritter ; edited by Robert Debever.
Cartan, Elie, 1869-1951.
Einstein, Albert, 1879-1955
Physicists -- Correspondence.
Unified field theories.
1979.
Einstein, Albert, 1879-1955
Debever, Robert.
Absolute parallelism.
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