参考文献
Willems
Bulletin des Societes Chimiques Belges, 1955 , vol. 64, p. 747,752, 768
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Helberger; Lantermann
Justus Liebigs Annalen der Chemie, 1954 , vol. 586, p. 158,163
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Truce; Hoerger
Journal of the American Chemical Society, 1954 , vol. 76, p. 5357,5360