Neuberg; Schuchardt; Vercellone
Biochemische Zeitschrift, 1934 , vol. 271, p. 229

Posternak
C. r. Soc. Phys. Geneve, 1926 , vol. 43, p. 17
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Jost
Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie, 1927 , vol. 165, p. 175,177
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Greenwald
Journal of Biological Chemistry, 1925 , vol. 63, p. 341,344