Mohammad I. Hossain and  Omar F. Hamim,  Evaluation of Cast-in-Situ Pile Condition Using Pile Integrity Test.   journal   = {International Journal of Geotechnical and Geological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2020, vol. 163(7). 150 - 155
    [viewed 09 August 2020]. Available from: https://publications.waset.org/pdf/10011293.