Jin, Xiao-duo, et al. “Phenolic Characteristics and Antioxidant Activity of Merlot and Cabernet Sauvignon Wines Increase With Vineyard Altitude in a High-Altitude Region”. South African Journal of Enology and Viticulture, vol. 38, no. 2, Oct. 2017, pp. 132-43, doi:10.21548/38-2-1068.