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2. Further Experiments on Positive Rays;Thomson;Phil. Mag.,1912
3. A Positive Mass Spectrograph;Aston;Phil. Mag.,1919
4. The Cause and Nature of Radioactivity;Rutherford;J. Chem. Soc. London,1902
5. The Production of Helium from Radium and the Transformation of Matter;Rutherford,1906