S. H. Yahaya and  J. M. Ali and  M. R. Arham,  The Analysis of Duct Model Through Structural and Dynamic Schemes.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2011, vol. 51(3). 664 - 667
    [viewed 07 December 2019]. Available from: https://publications.waset.org/pdf/9999.