Ferenc Kovács and  Gábor Hosszú,  Highly Accurate Tennis Ball Throwing Machine with Intelligent Control.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2015, vol. 105(9). 1629 - 1633
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10002298.