Anurag Sharma and  Christian W. Omlin,  Determining Cluster Boundaries Using Particle Swarm Optimization.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 3575 - 3579
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/11050.