S. Karnchanawong and  P. Yongpisalpop,  Leachate Generation from Landfill Lysimeter using Different Types of Soil Cover.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2009, vol. 27(3). 60 - 64
    [viewed 16 April 2021]. Available from: https://publications.waset.org/pdf/9075.