DelValls, TA, and PM Chapman. “Site-Specific Sediment Quality Values for the Gulf of Cádiz (Spain) and San Francisco Bay (USA), Using the Sediment Quality Triad and Multivariate Analysis”. Ciencias Marinas, vol. 24, no. 3, Mar. 1998, pp. 313-36, doi:10.7773/cm.v24i3.753.