Semon
Journal of the American Chemical Society, 1923 , vol. 45, p. 189
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Gmelin Handbook: N: MVol.4, 2.1, page 857 - 866
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Raschig, F.
Schwefel- und Stickstoffstudien, Leipzig-Berlin 1924,p.1
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 31, # 2 p. 330 - 339
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