WASET
    Mauricio Terceros and  Jann-Eike Saathoff and  Martin Achmus,  Assessment of Pier Foundations for Onshore Wind Turbines in Non-cohesive Soil.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2019, vol. 154(10). 633 - 642
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10010819.