S. Al-Asheh and  K. Al-Emadi,  Sorptive Storage of Natural Gas on Molecular Sieves: Dynamic Investigation.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2008, vol. 20(8). 158 - 165
    [viewed 20 January 2020]. Available from: https://publications.waset.org/pdf/13922.