参考文献
Letch; Linstead
Journal of the Chemical Society, 1932 , p. 445,453
Journal of the Chemical Society, 1933 , p. 613
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Heim
Bulletin des Societes Chimiques Belges, 1931 , vol. 40, p. 216
Bulletin des Societes Chimiques Belges, 1932 , vol. 41, p. 320