Hecht
American Chemical Journal, 1890 , vol. 12, p. 505
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American Chemical Journal, 1879 , vol. 1, p. 176
Chemische Berichte, 1880 , vol. 13, p. 34
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Journal of the American Chemical Society, 1947 , vol. 69, p. 1797
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Katritzky
Journal of the Chemical Society, 1955 , p. 2586,2591