Reference:
[1] Justus Liebigs Annalen der Chemie, 1873, vol. 168, p. 210
[2] Justus Liebigs Annalen der Chemie, 1887, vol. 237, p. 163
[3] Journal of the Chemical Society, 1902, vol. 81, p. 1335[4] Journal of the Chemical Society, 1906, vol. 89, p. 1454