Cagnasso, E. et al. 2011. Evolution of the Phenolic Content and Extractability Indices During Ripening of Nebbiolo Grapes from the Piedmont Growing Areas over Six Consecutive Years. South African Journal of Enology and Viticulture. 32, 2 (Dec. 2011), 229–241. DOI:https://doi.org/10.21548/32-2-1383.