András Király and  Tamás Varga and  János Abonyi,  Constrained Particle Swarm Optimization of Supply Chains.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2012, vol. 67(7). 1113 - 1121
    [viewed 21 April 2021]. Available from: https://publications.waset.org/pdf/9278.