van Erp
Journal fuer Praktische Chemie (Leipzig), 1930 , vol. <2> 127, p. 20,22

van Erp
Journal fuer Praktische Chemie (Leipzig), 1930 , vol. <2> 127, p. 20,22

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Journal of the Chemical Society, 1915 , vol. 107, p. 940
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Journal of the Chemical Society, 1911 , vol. 99, p. 1188
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