Wilhelmy, C., C. Pavez, E. Bordeu, and N. Brossard. “A Review of Tannin Determination Methods Using Spectrophotometric Detection in Red Wines and Their Ability to Predict Astringency”. South African Journal of Enology and Viticulture 42, no. 1 (April 16, 2021): 1. Accessed February 28, 2026. https://www.journals.ac.za/sajev/article/view/3852.