I do not have this reference in full but it is Bain, E. C. 1923 Chem. Met. Eng. vol 28 pp21, 65 also in 1923 Transactions of the American Institute of Metallurgical Engineers vol 68 p 625. ..... the possibility that ordering in gold alloys may take place had already been considered by the great German metallurgist Tammann in 1919 (cf Z. Anorg. Chem. 1919 vol 107 p1 et seq.)
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