Kambiz Tahvildari and Shakila ila Motamedi, Studying the Environmental Effects of using Biogas Energy in Iran. journal = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2010, vol. 44(8). 390 - 394 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/10413.