IN a previous letter1 we stated that no evidence had been obtained for the surface migration of barium over nickel or tungsten. We have recently published these results2 in detail, together with the results of the behaviour of thorium on tungsten.
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NATURE, 140, 152 (1937).
Phil Mag., 26, Dec. 1937.
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BENJAMIN, M., JENKINS, R. Migration of Barium on Molybdenum. Nature 143, 279–280 (1939). https://doi.org/10.1038/143279b0
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