Gruen; Wirth
Chemische Berichte, 1920 , vol. 53, p. 1307
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Sato
J.Soc.chem.Ind.Japan Spl., vol. 30, p. 74 B
Chem. Zentralbl., 1929 , vol. 100, # II p. 1986
Gruen; Ulbrich; Krczil
Angewandte Chemie, 1926 , vol. 39, p. 424
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Mueller,A.; Saville
Journal of the Chemical Society, 1925 , vol. 127, p. 599,600