Wagner
Journal fuer Praktische Chemie (Leipzig), 1891 , vol. <2>44, p. 261 Anm.
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Clarke
Journal of the American Chemical Society, 1909 , vol. 31, p. 560
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Bouveault; Locquin
Bulletin de la Societe Chimique de France, 1904 , vol. <3>31, p. 1158