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Sihvonen; Pylkkaenen
Suomen Kemistilehti B, 1935 , vol. 8, p. 37
Chem. Zentralbl., 1936 II 603.
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Sihvonen
Suomen Kemistilehti B, 1932 , vol. 5, p. 41
Chem. Zentralbl., 1932 , vol. 103, # II p. 3549
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Tommila
Annales Academiae Scientiarum Fennicae, Series A, 1932 , vol. 36, # 1 p. 63
Chem. Zentralbl., 1932 , vol. 103, # II p. 2311