Sandmeyer
Chemische Berichte, 1885 , vol. 18, p. 1495
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Bogert; Kohnstamm
Journal of the American Chemical Society, 1903 , vol. 25, p. 479
Meldola
Journal of the Chemical Society, 1883 , vol. 43, p. 439
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Bamberger
Chemische Berichte, 1895 , vol. 28, p. 830
Chemische Berichte, 1897 , vol. 30, p. 216 Anm.4