Ferrara, G., and G. Brunetti. “Effects of the Times of Application of a Soil Humic Acid on Berry Quality of Table Grape (Vitis Vinifera L.) Cv Italia”. Spanish Journal of Agricultural Research 8, no. 3 (September 1, 2010): 817-822. Accessed May 1, 2024. https://sjar.revistas.csic.es/index.php/sjar/article/view/1283.