Open Science Research Excellence
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 24 August 2019]. Available from: http://waset.org/publications/2628.