1. J.P. Den Hartog, Mechanical Vibrations. Civil, Mechanical and Other Engineering Series, 1st edn.: 1934 (Dover Publications, Mineola, 1985)
2. J.P. Den Hartog, Vibration of frames of electrical machines. J. Appl. Mech. 50, 1–6 (1828)
3. E. Volterra, J.D. Morrel, On the fundamental frequencies of curved beams. Bull. Polytech. Inst. Jassy 7(11), 1–2 (1961)
4. K. Federhofer, Dynamik des Bogenträgers und Kreisringes [Dynamics of Arches and Circular Rings] (Springer, Wien, 1950)
5. M.S. Qatu, A.A. Elsharkawy, Vibration of laminated composite arches with deep curvature and arbitrary boundaries. Comput. Struct. 47(2), 305–311 (1993).
https://doi.org/10.1016/0045-7949(93)90381-M