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[164] Coster and Hevesy, Nature, III (1923), 79; Ber. d. chem. Ges., LVI (1923), 1503.
[165] Ann. d. Phys. (4), VIII (1903), 149.
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[167] Ann. d. Phys. (4), XVII (1905), 132; XX (1906), 199.
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[172] Phys. Rev., VI (1915), 166; Proc. Nat. Acad., II (1916), 90; Phys. Rev., VII (1916), 599; IX, 568; X (1917), 93 and 624.