Jesus, C. C., de Stigter, H., Miranda, P., Oliveira, A., and Rocha, F. 2013. Distribution patterns and enrichment of lead, zinc and copper in surface sediments of the central Portuguese shelf and upper slope. Journal of Iberian Geology 39, 2, 335–348. DOI:https://doi.org/10.5209/rev_JIGE.2013.v39.n2.43196