参考文献
Willstaetter; Seitz; v. Braun
Chemische Berichte, 1925 , vol. 58, p. 385
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v. Braun; Bayer
Chemische Berichte, 1925 , vol. 58, p. 391
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v. Braun; Bayer; Blessing
Chemische Berichte, 1924 , vol. 57, p. 400