Arie Pujiwati and  Kengo Nakamura and  Noriaki Watanabe and  Takeshi Komai,  Total and Leachable Concentration of Trace Elements in Soil towards Human Health Risk, Related with Coal Mine in Jorong, South Kalimantan, Indonesia .   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2017, vol. 130(10). 957 - 965
    [viewed 13 October 2019]. Available from: https://publications.waset.org/pdf/10007984.