Germann
Journal of Physical Chemistry, 1924 , vol. 28, p. 884
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Delepine
Bulletin de la Societe Chimique de France, 1920 , vol. <4>27, p. 282
Schmidt; Schumacher; Kuhlmann
Chemische Berichte, 1921 , vol. 54, p. 1483
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Macbeth; Pratt
Journal of the Chemical Society, 1921 , vol. 119, p. 355