Nuo Duan and  Yi Pik Cheng,  A Discrete Element Method Centrifuge Model of Monopile under Cyclic Lateral Loads.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2016, vol. 110(2). 213 - 218
    [viewed 13 August 2020]. Available from: https://publications.waset.org/pdf/10003760.