WASET
    J.W. Xiang and  M. Liang,  Multiple Crack Identification Using Frequency Measurement.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2011, vol. 52(4). 779 - 784
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/5144.