Occurrence and risk assessment of pesticides in a Mediterranean Basin with strong agricultural pressure (Guadiana Basin: Southern of Portugal) - Palma, Patrícia; Fialho, S.; Lima, A.; Catarino, A.; Costa, Maria João; Barbieri, M.V.; Monllor-Alcaraz, L.S.; Postigo, C.; Lopezde Alda, M. (2021)