Herzig
Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie, 1921 , vol. 117, p. 18
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Dox
Journal of the American Chemical Society, 1936 , vol. 58, p. 1633
Halpern; Jones
Journal of the American Pharmaceutical Association (1912-1977), 1949 , vol. 38, p. 352
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Halpern et al.
Journal of the American Pharmaceutical Association (1912-1977), 1948 , vol. 37, p. 333,334