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4. Bettencourt, A., Bricker, S.B., Ferreira, J.G., Franco, A., Marques, J.C., Melo, J.J., Nobre, A., Ramos, L., Reis, C.S., Salas, F., Silva, M.C., Simas, T., Wolff, W. 2004. Typology and reference conditions for Portuguese transitional and coastal waters (TICOR). INAG IMAR, Portugal.
5. A new look at the zonation of the benthos along the estuarine gradient;Boesch,1977