Christopher C. Ihueze and  Constance C. Obiuto and  Christian E. Okafor and  Charles C. Okpala,  Orthogonal Array Application and Response Surface Method Approach for Optimal Product Values: An Application for Oil Blending Process.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2013, vol. 76(4). 610 - 614
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9593.