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3. Baron, A. L. 1950. “Handbook of Antibiotics”, Reinhold Pub. Co., New York.
4. Barton–Wright, E. C. 1953. The Carbohydrates of Wort and Aspects of Attenuation, pp. 98–109, European Brewery Convention, Proceedings of the Congress Nice 1953, Elsevier Pub. Co., New York.