Somayeh Farzin and  Hossein Teimoori Nezhad,  E-Procurement, the Golden Key to Optimizing the Supply Chains System.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2010, vol. 42(6). 837 - 843
    [viewed 13 May 2021]. Available from: https://publications.waset.org/pdf/10542.