Azam Beg and  P. W. Chandana Prasad and  S.M.N.A Senenayake,  Estimating Shortest Circuit Path Length Complexity.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2008, vol. 21(9). 3146 - 3150
    [viewed 16 April 2021]. Available from: https://publications.waset.org/pdf/11750.