WASET
    M.A. Ahmad,  Sway Reduction on Gantry Crane System using Delayed Feedback Signal and PD-type Fuzzy Logic Controller: A Comparative Assessment.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2009, vol. 26(2). 471 - 476
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/642.