Hantzsch; Kraft
Chemische Berichte, 1891 , vol. 24, p. 3516
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Peterson
American Chemical Journal, 1911 , vol. 46, p. 335
Chem. Zentralbl., 1911 , vol. 82, # II p. 1928
Skinner; Ruhemann
Journal of the Chemical Society, 1888 , vol. 53, p. 556
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Freund; Kuh
Chemische Berichte, 1890 , vol. 23, p. 2837