WASET
    B. Demirel and  T.T. Onay and  O. Yenigün,  Application of Biogas Technology in Turkey.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 285 - 289
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/2628.