Álvarez-Muñoz, D.; Sáez, M.; Blasco, J.; Gómez-Parra, A.; González-Mazo, E. Enzymatic Activity of Acid and Alkaline Phosphatase and Catalase in Ruditapes Philippinarum As Biomarkers of Stress Caused by Anionic (C11-LAS) and Non-Ionic (NPEO2.8) Surfactants. Cienc. Mar. 2006, 32, 447-455.