Ribeiro de Lima, María Teresa, Mary T. Kelly, Marie-Thérèse Cabanis, Geneviève Cassanas, Lurdes Matos, Jorge Pinheiro, and Alain Blaise. “Determination of Iron, Copper, Manganese and Zinc in the Soils, Grapes and Wines of the Azores”. OENO One 38, no. 2 (June 30, 2004): 109–118. Accessed September 20, 2021. https://oeno-one.eu/article/view/925.