Tishler; Wendler
Journal of the American Chemical Society, 1941 , vol. 63, p. 1532,1535
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Karrer; Geiger
Helvetica Chimica Acta, 1940 , vol. 23, p. 455,457-459
John et al.
Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie, 1939 , vol. 257, p. 173,175
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Frampton et al.
Journal of the American Chemical Society, 1954 , vol. 76, p. 283