参考文献
Hantzsch; Lifschitz
Chemische Berichte, 1912 , vol. 45, p. 3030
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Hantzsch; Pohl
Chemische Berichte, 1902 , vol. 35, p. 2964,2967,2978
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Hantzsch
Chemische Berichte, 1912 , vol. 45, p. 3036
Chemische Berichte, 1930 , vol. 63, p. 1280