Pham, M. H., Nguyen, T. N., Nguyen, H. M., Pham, H. V., Berg, M., Alder, A. C., & Giger, W. (2010). Recent levels of organochlorine pesticides and polychlorinated biphenyls in sediments of the sewer system in Hanoi, Vietnam. Environmental Pollution, 158(3), 913-920. https://doi.org/10.1016/j.envpol.2009.09.018