1. Plan de Policía de Aguas del litoral Andaluz;A.M.A. (Agencia de Medio Ambiente de Andalucía, Spain),1994
2. Heavy metals in the surface sediments of the tidal river Tinto (SW Spain);Cabrera;Fresenius Envir. Bull,1992
3. Metal Pollution in the Aquatic Environment;Förstner,1983
4. Assessment of metal mobility in sludges and solid wastes;Förstner,1990
5. Study of the stability of extractable trace metals contents in river sediment using sequential extraction;Friedler;Analyst,1994