Santesteban LG, Loidi M, Urretavizcaya I, Galar M, Crespo-Martínez S, Royo JB, et al. Nitrogen isotope ratio (δ15N): a nearly unexplored indicator that provides useful information in viticulture. OENO One [Internet]. 2024 May 15 [cited 2025 Jan. 23];58(2). Available from: https://oeno-one.eu/article/view/7961