WASET
    Wei Zhang and  Hong Yu and  Xian-ping Zhao and  Da-da Wang and  Fei Xue,  The Comprehensive Study Based on Ultrasonic and X-ray Visual Technology for GIS Equipment Detection.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
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    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/14902.