WASET
    S. J. Shahidzadeh Tabatabaei and  A. M. Fattahi,  Finite Element Method for Modal Analysis of FGM.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2016, vol. 110(2). 352 - 356
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10003831.