Vivas de Gaulejac, Nathalie, et al. “Identification of Procyanidin A2 in Grape and Wine of <em>Vitis vinifera< em> L. Cv: Merlot Noir and Cabernet Sauvignon”. OENO One, vol. 35, no. 1, Mar. 2001, pp. 51-56, doi:10.20870/oeno-one.2001.35.1.995.