1. Free Vibration Analysis of Beams and Shafts;Gorman,1975
2. Formulas for Natural Frequency and Mode Shape;Belvins,1979
3. Torsional frequencies and mode shapes of generally constrained shafts and piping;Kameswara Rao;Journal of Sound and Vibration,1988
4. Torsional vibrations of a nonprismatic hollow shaft;Rezeka;Journal of Vibration, Acoustics, Stress and Reliability in Design, ASME,1989
5. Torsional vibrations of beams of thin walled open cross section;Gere;Journal of Applied Mechanics,1954