<https://asmedigitalcollection.asme.org/vibrationacoustics/article/123/4/536/461154/Dynamic-Analysis-of-Rotating-Beams-with-Nonuniform>
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<https://asmedc.silverchair.com/vibrationacoustics/article-abstract/123/4/536/461154/Dynamic-Analysis-of-Rotating-Beams-with-Nonuniform?searchresult=1>