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Z. Anorg. Chem., 1929 , vol. 42, p. 807 - 810
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Ruff, O.
Chim. Ind., 1936 , vol. 35, p. 255 - 266
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Gmelin Handbook: Ca: MVol.A2, 2.1, page 382 - 384
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Ruff, O.
15th Congr. Chim. ind., Bruxelles, 1935, Vol. 1, p. 68-79