Martins, M, AM Ferreira, and C Vales. “PCB Composition in Flood Material and Sediments from the Guadiana River Estuary”. Ciencias Marinas 31, no. 1B (March 6, 2005): 285–291. Accessed April 23, 2026. https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/87.