[1] Yu SD, Cleghorn WL. Free vibration of a spinning stepped
     Timoshenko beam.
相关链接：http://adsabs.harvard.edu/abs/2000JAM....67..839Y
[2] Filipich CP, Maurizi MJ, Rosales MB. Free vibrations of a
     spinning uniform beam with ends elastically restrained
     against rotation.
相关链接：http://adsabs.harvard.edu/abs/1987JSV...116..475F
[3] Rosales MB, Filipich CP, Maurizi MJ. Comments on
    dynamic stability of spinning beams of unsymmetrical
    cross-section with distinct end conditions.
相关链接;http://www.sciencedirect.com/science?_ob=ArticleURL&