Long-term monitoring of trace elements in estuarine waters, a case study: The estuary of the nerbioi-Ibaizabal River (Bilbao, Basque country)

1. Gredilla, A.
2. de Vallejuelo, S.F.-O.
3. Arana, G.
4. de Diego, A.
5. Madariaga, J.M.