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Suggested reading for you:
Álvarez, I., Aleixandre, J.L., García, M.J. and Lizama, V. 2006. Impact of prefermentative maceration on the phenolic and volatile compounds in Monastrell red wines. Analytica Chimica Acta, 563, 109–115.
Arnold, R.A. and Noble, A.C. 1979. Am. J. Enol...