Konghe Xie,  Consensus of Multi-Agent Systems under the Special Consensus Protocols.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2017, vol. 121(1). 42 - 47
    [viewed 11 December 2019]. Available from: https://publications.waset.org/pdf/10006623.