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Bladin
Chemische Berichte, 1885 , vol. 18, p. 1548
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Bladin
Chemische Berichte, 1892 , vol. 25, p. 1412
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Bamberger; De Gruyter
Chemische Berichte, 1893 , vol. 26, p. 2392
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Widman
Chemische Berichte, 1893 , vol. 26, p. 2616
Oef. Sv., 1895 , p. 25
