N. Sapari and S. Mustapha and H. Jusoh, Enhancing Landfill Gas Production by Methanogenic Sand Layer. journal = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2011, vol. 60(12). 766 - 773 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/10280.