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11

Miss Brooks, Phil. Mag. Sept. 1904.

12

Rutherford y Soddy, Trans. Chem. Soc. 81, p. 837, 1902. Phil. Mag. nov. 1902.

13

Miss Brooks, Phil. Mag. Sept. 1904.

14

Rutherford, Phil. Trans. A. p. 169, 1904.

15

Giesel, Ber. d. D. Chem. Ges. p. 775, 1905.

16

Godlewski, Nature, p. 294, 19 de ene. de 1905.

17

Debierne, C. R. 138, p. 411, 1904.

18

Miss Brooks, Phil. Mag. Sept. 1904.

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