M. F. Yaqub and  I. Gondal and  J. Kamruzzaman,  Envelope-Wavelet Packet Transform for Machine Condition Monitoring.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 2470 - 2476
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/3850.