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Koelln
Justus Liebigs Annalen der Chemie, 1918 , vol. 416, p. 231
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Japp; Cleminshaw
Journal of the Chemical Society, 1887 , vol. 51, p. 553
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Pinner
Chemische Berichte, 1884 , vol. 17, p. 1998
Chemische Berichte, 1887 , vol. 20, p. 2345 Anm.