Wasiu O. Ajagbe and  Habeeb O. Hamzat and  Waris A. Adebisi,  Result Validation Analysis of Steel Testing Machines.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2018, vol. 143(11). 1029 - 1032
    [viewed 18 November 2019]. Available from: https://publications.waset.org/pdf/10009749.