İbrahim Hakkı Erkan and  Özcan Tan,  The Effect of Pulling and Rotation Speed on the Jet Grout Columns.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 120(12). 1690 - 1694
    [viewed 01 March 2021]. Available from: https://publications.waset.org/pdf/10006931.