Chattaway; Wadmore
Journal of the Chemical Society, 1902 , vol. 81, p. 200
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Dixon; Taylor
Journal of the Chemical Society, 1913 , vol. 103, p. 978
Biechler, J.
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1935 , vol. 200, p. 141 - 143
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Gmelin Handbook: C: MVol.D3, 6.2.5.6.7.5, page 234 - 236