Migbar Assefa ,  Modal Analysis of Machine Tool Column Using Finite Element Method.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 76(4). 699 - 708
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/9997091.