Z. El Felsoufi and  L. Azrar,  Flutter Analysis of Slender Beams with Variable Cross Sections Based on Integral Equation Formulation.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2015, vol. 98(2). 407 - 418
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10002608.