Asim Kumar Pal and  Debabrata Nath and  Sumit Chakraborty,  A Discriminatory Rewarding Mechanism for Sybil Detection with Applications to Tor.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2010, vol. 39(3). 152 - 159
    [viewed 22 January 2020]. Available from: https://publications.waset.org/pdf/13802.