WASET
    Tianchai Suksri and  U-thai Sritheeravirojana and  Arjin Numsomran and  Viriya Kongrattana and  Thongchai Werataweemart,  T-DOF PID Controller Design using Characteristic Ratio Assignment Method for Quadruple Tank Process.   journal   = {International Journal of Electrical and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2007, vol. 12(12). 4154 - 4160
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/4501.