Delfosse, T., Bar, I., Hansenne, J., Delmelle, P., & Delvaux, B. (2001). Fluoride as an extractant for inorganic sulphate in Andosols exposed to S deposition. International Symposium Volcanic soils, properties and Land use, ., Ponta Delgada, Açores. https://hdl.handle.net/2078.5/32318