WASET
    Michal M. Koziol,  Changes in Selected Fuel Properties of Sewage Sludge as a Result of its Storage.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2012, vol. 64(4). 163 - 167
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/13365.