参考文献
Freudenberg; Fikentscher; Wenner
Justus Liebigs Annalen der Chemie, 1925 , vol. 442, p. 321
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Pratt; Robinson
Journal of the Chemical Society, 1924 , vol. 125, p. 195
Journal of the Chemical Society, 1925 , vol. 127, p. 1132 Anm.