Rodrigues, S. C., and A. Bianchini. “Extraction and Concentration of Freshwater – and Seawater – Derived Dissolved Organic Matter for Use in Aquatic Toxicology Studies”. Ecotoxicology and Environmental Contamination, vol. 2, no. 3, Oct. 2007, pp. 275-81, doi:10.5132/jbse.2007.03.011.