Hong-fang Ma and  Cong-yi He and  Hai-tao Zhang and  Wei-yong Ying and  Ding-ye Fang,  Methanation Catalyst for Low CO Concentration.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2014, vol. 91(7). 635 - 638
    [viewed 06 May 2021]. Available from: https://publications.waset.org/pdf/9998767.