Udeme O. Ini and  Edikan E. Akpanibah,  Pension Plan Member’s Investment Strategies with Transaction Cost and Couple Risky Assets Modelled by the O-U Process.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2021, vol. 172(4). 63 - 70
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10011990.