Letters on absolute parallelism, 1929-1932. By Elie Cartan and Albert Einstein. Ed. by Robert Debever. Original text, English tr. by Jules Leroy and Jim Ritter.
Letters on absolute parallelism, 1929-1932. By Elie Cartan and Albert Einstein. Ed. by Robert Debever. Original text, English tr. by Jules Leroy and Jim Ritter.