Note 110 — Chapter VII · MODERN ALCHEMY
Reading edition
Sir William Ramsay and Frederick Soddy: “Experiments in Radioactivity and the Production of Helium from Radium,” Proceedings of the Royal Society of London, vol. lxxii. (1903), pp. 204 et seq.
[111] E. Rutherford, F.R.S., and T. Royds, M.Sc.: “The Nature of the α-Particle from Radio-active Substances,” Philosophical Magazine [6], vol. xvii. (1909), pp. 281 et seq.