Del-Valls, T. et al. 1999. Thallium in the marine environment: First ecotoxicological assessments in the Guadalquivir estuary and its potential adverse effect on the Doñana European natural reserve after the Aznalcóllar mining spill (SW Spain). Ciencias Marinas. 25, 2 (Mar. 1999), 161–175. DOI:https://doi.org/10.7773/cm.v25i2.670.