Wolff Justus Liebigs Annalen der Chemie, 1912 , vol. 394, p. 85 Justus Liebigs Annalen der Chemie, 1913 , vol. 399, p. 288,291 Full Text Show Details Chattaway; Cumming; Wilsdon Journal of the Chemical Society, 1911 , vol. 99, p. 1952