Gattermann; Zelinsky
Justus Liebigs Annalen der Chemie, 1888 , vol. 244, p. 58
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Zelinsky
Chemische Berichte, 1887 , vol. 20, p. 2021
Hopff
Angewandte Chemie, 1948 , vol. 60, p. 245
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Hopff, H.; Ohlinger, H.
Angewandte Chemie, 1949 , vol. 61, p. 183 - 185
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Gmelin Handbook: C: MVol.D3, 4.2.3, page 132 - 132