WASET
    Sandija Zeverte-Rivza and  Irina Pilvere and  Baiba Rivza,  Risk Assessment Results in Biogas Production from Agriculture Biomass.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 88(4). 918 - 924
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/9997874.