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  1. Helmick, Phys. Review, 17, 8, p. 135; 1921
  2. Mallet,Phil. Stag. 44, (263), p. 904; 1922.

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Helmick, Phys. Review, 17, 8, p. 135; 1921

Mallet,Phil. Stag. 44, (263), p. 904; 1922.

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