(1971). Analytical Methods for Polyphenols in Brewing. Part II. A New Method for Determination of Anthocyanogens and Catechins (Tanninogens) in Wort and Beer. Proceedings. Annual meeting - American Society of Brewing Chemists: Vol. 29, Proceedings of the Annual Meeting 1971, pp. 159-170.
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M. Dadić (1971) studied this question.
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