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Archiv der Pharmazie (Weinheim, Germany), 1937 , vol. 275, p. 397,404
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Szeki
Magyar gyogysz. Tars. Ert., 1937 , vol. 13, p. 680,684
Chem. Zentralbl., 1937 , vol. 108, # II p. 2345
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Ullyot et al.
Journal of Organic Chemistry, 1945 , vol. 10, p. 429,434