Khairul Jauhari and  Achmad Widodo and  Ismoyo Haryanto,  Evaluation of Dynamic Behavior a Machine Tool Spindle System through Modal and Unbalance Response Analysis.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 98(2). 400 - 406
    [viewed 09 December 2019]. Available from: https://publications.waset.org/pdf/10002193.