参考文献
Bergmann; Hartrott
Journal of the Chemical Society, 1935 , p. 1218
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Staellberg-Stenhagen
Arkiv foer Kemi, 1946 , vol. 22 A, # 19 p. 10
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Hommelen
Bulletin des Societes Chimiques Belges, 1933 , vol. 42, p. 243,249