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af Haellstroem
Chemische Berichte, 1905 , vol. 38, p. 2288
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Will; Albrecht
Chemische Berichte, 1884 , vol. 17, p. 2103
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Monatshefte fuer Chemie, 1889 , vol. 10, p. 724
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Will
Chemische Berichte, 1885 , vol. 18, p. 1324
Chemische Berichte, 1887 , vol. 20, p. 299,301