Gray, Michael J.; Hartshorn, Michael P.; Penfold, Bruce R.; Vaugnan, John
Australian Journal of Chemistry, 1984 , vol. 37, # 1 p. 55 - 64

Zincke
Journal fuer Praktische Chemie (Leipzig), 1901 , vol. <2> 63, p. 184
Justus Liebigs Annalen der Chemie, 1905 , vol. 341, p. 310,313
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Zincke; Schneider; Emmerich
Justus Liebigs Annalen der Chemie, 1903 , vol. 328, p. 316

Cohen; Marshall
Journal of the Chemical Society, 1904 , vol. 85, p. 527