Bergmann
Chemistry and Industry (London, United Kingdom), 1935 , p. 534
Chem. Zentralbl., 1935 , vol. 106, # II p. 1364
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Haskelberg
Chemistry and Industry (London, United Kingdom), 1935 , p. 261
Chem. Zentralbl., 1935 , vol. 106, # I p. 3791