WASET
    Chaoraingern J. and  Trisuwannawat T. and  Numsomran A.,  PID Controller Design for Following Control of Hard Disk Drive by Characteristic Ratio Assignment Method.   journal   = {International Journal of Electrical and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2009, vol. 35(11). 1909 - 1915
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/5109.