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Behrens et al.
Journal of Biological Chemistry, 1948 , vol. 175, p. 771,778
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Phillips; Baltzly
Journal of the American Chemical Society, 1947 , vol. 69, p. 200,203
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E. Lilly and Co.
Patent: US2440359 , 1945 ;
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E. Lilly and Co.
Patent: US2463942 , 1945 ;