WASET
    Andra Blumberga and  Armands Gravelsins and  Haralds Vigants and  Dagnija Blumberga ,  Biotechonomy System Dynamics Modelling: Sustainability of Pellet Production.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2017, vol. 124(4). 377 - 381
    [viewed 04 May 2024]. Available from: https://publications.waset.org/pdf/10006689.