T. Makkasap and  T. Satapanajaru,  Spatial Distribution of Cd, Zn and Hg in Groundwater at Rayong Province, Thailand.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2010, vol. 48(12). 686 - 689
    [viewed 17 January 2021]. Available from: https://publications.waset.org/pdf/1141.