Wei Chen and  Cui-you Yao and  Yue Qiu,  PSO-based Possibilistic Portfolio Model with Transaction Costs.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2011, vol. 53(5). 445 - 450
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/6561.