Chansheng He and  Carlo DeMarchi,  Modeling Spatial Distributions of Point and Nonpoint Source Pollution Loadings in the Great Lakes Watersheds.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2009, vol. 30(6). 156 - 162
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/8318.