H. Y. Jung and  Ju H. Park and  S. M. Lee,  Sampled-Data Control for Fuel Cell Systems.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 104(8). 781 - 784
    [viewed 21 September 2019]. Available from: https://publications.waset.org/pdf/10001950.