Alexander A. Muravyov,  An Approach for Transient Response Calculation of large Nonproportionally Damped Structures using Component Mode Synthesis.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2011, vol. 50(2). 413 - 426
    [viewed 21 January 2020]. Available from: https://publications.waset.org/pdf/10048.