Lippich
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Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie, 1914 , vol. 90, p. 124
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Dakin
American Chemical Journal, 1910 , vol. 44, p. 49
Journ. of Biol. Chem., vol. 8, p. 27
Chem. Zentralbl., 1910 , vol. 81, # II p. 990