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Gmelin Handbook: Ru: SVol., 38, page 84 - 86
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Sandell, E. B.
Colorimetric Determinations of Traces of Metals, 3. Aufl., New York - London 1959, S. 780
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Sandell, E. B.
Colorimetric Determinations of Traces of Metals, 3. Aufl., New York - London 1959, S. 790
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Surasiti, C.
Diss. Abstr., Diss. Minnesota Univ. 1957 1958 , vol. 18, p. 59