Callear, A. B. Proceedings of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 1963 , vol. 276, p. 401 Full Text Show Details Wright, F. J. Journal of Physical Chemistry, 1960 , vol. 64, p. 1648 - 1652 Full Text View citing articles Show Details Gmelin Handbook: S: SVol.3, 1.10.1, page 17 - 21