WASET
    E. K. A. Ogunshile,  CompleX-Machine: An Automated Testing Tool Using X-Machine Theory.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2018, vol. 135(3). 132 - 140
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/10008653.